Details (11 results)

Sale date : 14/12/2016
Country : United Kingdom


Bonhams #23512 - 2016-12 - Fine Watches & Wristwatches including the Collection of a European Nobleman
New Bond Street
Lot ID : 87
 
• GBP
• EUR
• USD
Not sold
• ...
• ...
• ...
Estimation :
• 12000 - 18000
• 13691 - 20536
• 19201 - 28802


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1930's
Watch ID : 147**
Movement : Mechanical
Case material : Yellow Gold
Case form : Barrel-shaped
With diamonds : Yes :
Dial color : Black
Bracelet material : *leath*
Reference Detail : 2303 ,
Complications : Chronometre, Tachymetre


Rolex. A rare and unusual 18K gold manual wind single button chronograph wristwatch


Description : Ref:2303, Serial No.147**, Circa 1930 17-jewel manual wind movement with steel chronograph works, black dial with Arabic numeral hour markers, white outer 1/5th second divisions with Arabic five minute markers, further outer tachymetre scale, white dagger hands with centre chronograph hand, subsidiary dials at 3 and 9 for constant seconds and 30 minute recording, polished tonneau form case with screw down back, single chronograph button set within the crown, fitted brown leather strap with plated buckle, case, dial and movement signed 31mm.

Rolex. A rare and unusual 18K gold manual wind single button chronograph wristwatch




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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Watch ID : 147**

Movement : Mechanical

Case material : Yellow Gold

Case form : Barrel-shaped

With diamonds : Yes :

Dial color : Black

Bracelet material : *leath*

Reference Detail : 2303 ,

Complications : Chronometre, Tachymetre




Description : Ref:2303, Serial No.147**, Circa 1930 17-jewel manual wind movement with steel chronograph works, black dial with Arabic numeral hour markers, white outer 1/5th second divisions with Arabic five minute markers, further outer tachymetre scale, white dagger hands with centre chronograph hand, subsidiary dials at 3 and 9 for constant seconds and 30 minute recording, polished tonneau form case with screw down back, single chronograph button set within the crown, fitted brown leather strap with plated buckle, case, dial and movement signed 31mm.



Sale date : 08/11/2015

Country : Switzerland




Antiquorum #295 - 2015-11 - Important Modern & Vintage Timepieces

Geneva

Lot ID : 151

 

• CHF
• EUR
• USD

Sold :

• 17500
• 14278
• 20008

Estimation :

• 10000 - 15000
• 8159 - 12239
• 11433 - 17150




Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Case material : Yellow Gold

Dial color : Black

Reference Detail : 2303 , BABY SINGLE BUTTON .

Complications : Chronometre, Tachymetre




ROLEX, REF. 2303, BABY SINGLE BUTTON.CHRONOGRAPH, BLACK DIAL YELLOW GOLD.Rolex, case No. 16121, Ref. 2303. Made in 1935, retailed by.Kerby..Very fine and extremely rare, small, 18K yellow gold.wristwatch with co-axial button chronograph, registers.tachome

ROLEX, REF. 2303, BABY SINGLE BUTTON.CHRONOGRAPH, BLACK DIAL YELLOW GOLD.Rolex, case No. 16121, Ref. 2303. Made in 1935, retailed by.Kerby..Very fine and extremely rare, small, 18K yellow gold.wristwatch with co-axial button chronograph, registers.tachome




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Case material : Yellow Gold

Dial color : Black

Reference Detail : 2303 , BABY SINGLE BUTTON .

Complications : Chronometre, Tachymetre


Sale date : 29/05/2013
Country : Hong Kong SAR China


Christies #3219 - 2013-05 - Important watches
Hong Kong
Lot ID : 3004
 
• HKD
• EUR
• USD
Sold :
• 93750
• 12066
• 8606
Estimation :
• 50000 - 70000
• 4590 - 6426
• 6435 - 9009


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category :
Movement : Mechanical
Case material : Yellow Gold
Case form : Barrel-shaped
Dial color : Two-tone
Reference Detail : 2303
Dimensions : 28 MM
Complications : Chronometre, Tachymetre


ROLEX


Description : ROLEX. A FINE, VERY RARE AND SMALL 9K GOLD SINGLE BUTTON CHRONOGRAPH WRISTWATCH WITH TWO-TONE SECTOR DIAL.SIGNED ROLEX, CHRONOGRAPHE, REF. 2303, CASE NO. 16'728, CIRCA 1935.Mechanical lever movement, 17 jewels, gilt and silvered dial, black Arabic and baton numerals, outer blue tachymetre scale, two subsidiary dials for constant seconds and 30 minute register, tonneau-shaped case, snap on back, single button chronograph operated through the crown, case, dial and movement signed.28 mm. diam.

ROLEX




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category :

Movement : Mechanical

Case material : Yellow Gold

Case form : Barrel-shaped

Dial color : Two-tone

Reference Detail : 2303

Dimensions : 28 MM

Complications : Chronometre, Tachymetre




Description : ROLEX. A FINE, VERY RARE AND SMALL 9K GOLD SINGLE BUTTON CHRONOGRAPH WRISTWATCH WITH TWO-TONE SECTOR DIAL.SIGNED ROLEX, CHRONOGRAPHE, REF. 2303, CASE NO. 16'728, CIRCA 1935.Mechanical lever movement, 17 jewels, gilt and silvered dial, black Arabic and baton numerals, outer blue tachymetre scale, two subsidiary dials for constant seconds and 30 minute register, tonneau-shaped case, snap on back, single button chronograph operated through the crown, case, dial and movement signed.28 mm. diam.


Sale date : 13/05/2013
Country : Switzerland


Christies #1395 - 2013-05 - Important watches
Geneva
Lot ID : 272
 
• CHF
• EUR
• USD
Sold :
• 23750
• 27153
• 19378
Estimation :
• 15000 - 25000
• 12239 - 20398
• 17150 - 28583


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category :
Movement : Mechanical
Caliber : 10 /
Case material : Steel
Case form : Round
Dial color : Cream
Reference Detail : 2303
Dimensions : 28 MM
Complications : Chronometre, Tachymetre


Rolex


Description : Rolex. A very fine, rare and small stainless steel co-axial single button chronograph wristwatch with two-tone sector dial.Signed Rolex, ref. 2303, case no. 021187, circa 1928.Cal. 10 1/2''' mechanical lever movement, 17 jewels, two-tone silvered sector dial, Arabic 12 and 6, outer Arabic five minute divisions, outermost blue tachymetre scale, two subsidiary dials for constant seconds and 30 minutes register, small circular case, snap on back, chronograph button in the crown, stainless steel Rolex buckle, case, dial and movement signed.28 mm. diam.

Rolex




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category :

Movement : Mechanical

Caliber : 10 /

Case material : Steel

Case form : Round

Dial color : Cream

Reference Detail : 2303

Dimensions : 28 MM

Complications : Chronometre, Tachymetre




Description : Rolex. A very fine, rare and small stainless steel co-axial single button chronograph wristwatch with two-tone sector dial.Signed Rolex, ref. 2303, case no. 021187, circa 1928.Cal. 10 1/2''' mechanical lever movement, 17 jewels, two-tone silvered sector dial, Arabic 12 and 6, outer Arabic five minute divisions, outermost blue tachymetre scale, two subsidiary dials for constant seconds and 30 minutes register, small circular case, snap on back, chronograph button in the crown, stainless steel Rolex buckle, case, dial and movement signed.28 mm. diam.


Sale date : 20/03/2010
Country : Switzerland


Antiquorum #227 - 2010-03 - Important Watches
Geneva
Lot ID : 341
 
• CHF
• EUR
• USD
Sold :
• 48000
• 39163
• 54878
Estimation :
• 40000 - 60000
• 32636 - 48954
• 45732 - 68598


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1930's
Movement : Others
Caliber : 10 /
Case material : Yellow Gold
Dial color : Two-tone
Bracelet material : *leath*
Reference Detail : 2303
Thickness : 10.5 mm
Complications : Chronometre, Tachymetre


Rolex Ref. 2303, Single Button Chronograph.Rolex, Ref. 2303. Case No. 17890. Made in 1935, retailed by.Ronchi Milano..Very fine and extremely rare, small, 18K yellow gold wristwatch with.co-axial button chronograph, registers, tachometer and the original.


Description : C. Two-body, polished and brushed, concave lugs, snap-on case back..D. Two-tone, Sector with printed baton indexes and Arabic 6 and.12, outer minutes and fifth second divisions, subsidiary seconds and.30-minute register, outer tachometer. Blued steel feuille hands..M. Cal. 10 1/2''', rhodium-plated, 17 jewels, straight line lever.escapement, monometallic balance, self-compensating Breguet.balance spring. Index regulator..Dial, case and movement signed..Diam. 28.5 mm. Thickness 10.5 mm.

Rolex Ref. 2303, Single Button Chronograph.Rolex, Ref. 2303. Case No. 17890. Made in 1935, retailed by.Ronchi Milano..Very fine and extremely rare, small, 18K yellow gold wristwatch with.co-axial button chronograph, registers, tachometer and the original.




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Movement : Others

Caliber : 10 /

Case material : Yellow Gold

Dial color : Two-tone

Bracelet material : *leath*

Reference Detail : 2303

Thickness : 10.5 mm

Complications : Chronometre, Tachymetre




Description : C. Two-body, polished and brushed, concave lugs, snap-on case back..D. Two-tone, Sector with printed baton indexes and Arabic 6 and.12, outer minutes and fifth second divisions, subsidiary seconds and.30-minute register, outer tachometer. Blued steel feuille hands..M. Cal. 10 1/2''', rhodium-plated, 17 jewels, straight line lever.escapement, monometallic balance, self-compensating Breguet.balance spring. Index regulator..Dial, case and movement signed..Diam. 28.5 mm. Thickness 10.5 mm.


Sale date : 17/11/2008
Country : Switzerland


Christies #1357 - 2008-11 - Important watches
Geneva
Lot ID : 264
 
• CHF
• EUR
• USD
Sold :
• 40000
• 32636
• 45732
Estimation :
• 30000 - 40000
• 24477 - 32636
• 34299 - 45732


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1930's
Watch ID : 17887
Case form : Round
Reference Detail : 2303
Complications : Chronometre, Tachymetre


Rolex. A very fine, rare and small 18K gold single button chronograph wristwatch with two-tone silvered dial


Description : Lot Description.Rolex. A very fine, rare and small 18K gold single button chronograph wristwatch with two-tone silvered dial.Signed Rolex, retailed by Broudarge Paris, ref. 2303, case no. 17'887, circa 1930.With nickel-finished lever movement, 17 jewels, two-tone silvered dial, Arabic numerals, outer blue tachymetre scale, two subsidiary dials for constant seconds and 30 minutes register, two subsidiary dials indicating constant seconds and 30 minutes register, small circular case, snap on back, chronograph button in the crown, 18K gold Rolex buckle, case and movement signed by maker, dial signed by maker and retailer.28 mm. diam..View Lot Notes ›

Rolex. A very fine, rare and small 18K gold single button chronograph wristwatch with two-tone silvered dial




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Watch ID : 17887

Case form : Round

Reference Detail : 2303

Complications : Chronometre, Tachymetre




Description : Lot Description.Rolex. A very fine, rare and small 18K gold single button chronograph wristwatch with two-tone silvered dial.Signed Rolex, retailed by Broudarge Paris, ref. 2303, case no. 17'887, circa 1930.With nickel-finished lever movement, 17 jewels, two-tone silvered dial, Arabic numerals, outer blue tachymetre scale, two subsidiary dials for constant seconds and 30 minutes register, two subsidiary dials indicating constant seconds and 30 minutes register, small circular case, snap on back, chronograph button in the crown, 18K gold Rolex buckle, case and movement signed by maker, dial signed by maker and retailer.28 mm. diam..View Lot Notes ›


Sale date : 14/10/2007
Country : Switzerland


Antiquorum #171 - 2007-10 - Important Collectors’ Watches, Pocket Watches & Clocks
Geneva
Lot ID : 491
 
• CHF
• EUR
• USD
Sold :
• 51920
• 42362
• 59360
Estimation :
• 22000 - 27000
• 17950 - 22029
• 25153 - 30869


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1930's
Caliber : 10 /
Case material : Yellow Gold
Dial color : Black
Reference Detail : 2303
Thickness : 10.5 mm
Complications : Chronometre, Tachymetre


Ref. 2303, Yellow Gold Single Button Chronograph _ Black Dial.Rolex, case No. 16121, Ref. 2303. Made in 1935, retailed by Kerby..Very fine and extremely rare, small, 18K yellow gold wristwatch with co-axial button.chronograph, registers, tachometer, black


Description : C. Two-body, polished and brushed, concave lugs, pre’ssure case back. D. Black, with white painted baton.indexes, outer minutes and fifth of a second track, subsidiary seconds and 30-minute registers, outermost.tachometer graduation. White feuille hands. M. Cal. 10 1/2''', rhodium-plated, 17 jewels, straight-line lever.escapement, monometallic balance, self-compensating Breguet balance spring, index regulator..Dial, case and movement signed..Diam. 29 mm. Thickness 10.5 mm..From The Collection

Ref. 2303, Yellow Gold Single Button Chronograph _ Black Dial.Rolex, case No. 16121, Ref. 2303. Made in 1935, retailed by Kerby..Very fine and extremely rare, small, 18K yellow gold wristwatch with co-axial button.chronograph, registers, tachometer, black




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Caliber : 10 /

Case material : Yellow Gold

Dial color : Black

Reference Detail : 2303

Thickness : 10.5 mm

Complications : Chronometre, Tachymetre




Description : C. Two-body, polished and brushed, concave lugs, pre’ssure case back. D. Black, with white painted baton.indexes, outer minutes and fifth of a second track, subsidiary seconds and 30-minute registers, outermost.tachometer graduation. White feuille hands. M. Cal. 10 1/2''', rhodium-plated, 17 jewels, straight-line lever.escapement, monometallic balance, self-compensating Breguet balance spring, index regulator..Dial, case and movement signed..Diam. 29 mm. Thickness 10.5 mm..From The Collection


Sale date : 13/11/2006
Country : Switzerland


Christies #1339 - 2006-11 - Important pocket watches and wristwatches
Geneva
Lot ID : 332
 
• CHF
• EUR
• USD
Sold :
• 28800
• 23498
• 32927
Estimation :
• 10000 - 15000
• 8159 - 12239
• 11433 - 17150


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1920's
Watch ID : 022310
Case material : Silver
Case form : Round
Reference Detail : 2303
Complications : Chronometre, Tachymetre


Rolex. A very fine, rare and small stainless steel single button chronograph wristwatch with two-tone silvered sector dial


Description : Lot Description.Rolex. A very fine, rare and small stainless steel single button chronograph wristwatch with two-tone silvered sector dial.Signed Rolex, ref. 2303, case no. 022310, circa 1928.With nickel-finished lever movement, 17 jewels, the two-tone silvered sector dial with Arabic and baton numerals in black hard enamel to the inner chapter ring, outer tachymetre scale, two subsidiary dials indicating constant seconds and 30 minutes register, in circular case with downturned lugs, snap on back, chronograph button in the band, case, dial and movement signed.28 mm. diam..Special Notice.Prospective buyers should be aware that the importation of Rolex watches into the United States is highly restricted. Rolex watches may not be shipped into the USA and can only be imported personally. Generally a buyer may import only one watch into the USA. For further information please contact our specialists in charge of the sale. Please note other countries may have comparable import restrictions for luxury watches..View Lot Notes ›

Rolex. A very fine, rare and small stainless steel single button chronograph wristwatch with two-tone silvered sector dial




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1920's

Watch ID : 022310

Case material : Silver

Case form : Round

Reference Detail : 2303

Complications : Chronometre, Tachymetre




Description : Lot Description.Rolex. A very fine, rare and small stainless steel single button chronograph wristwatch with two-tone silvered sector dial.Signed Rolex, ref. 2303, case no. 022310, circa 1928.With nickel-finished lever movement, 17 jewels, the two-tone silvered sector dial with Arabic and baton numerals in black hard enamel to the inner chapter ring, outer tachymetre scale, two subsidiary dials indicating constant seconds and 30 minutes register, in circular case with downturned lugs, snap on back, chronograph button in the band, case, dial and movement signed.28 mm. diam..Special Notice.Prospective buyers should be aware that the importation of Rolex watches into the United States is highly restricted. Rolex watches may not be shipped into the USA and can only be imported personally. Generally a buyer may import only one watch into the USA. For further information please contact our specialists in charge of the sale. Please note other countries may have comparable import restrictions for luxury watches..View Lot Notes ›


Sale date : 14/05/2006
Country : Switzerland


Antiquorum #108 - 2006-05 - The Mondani Collection of Rolex Wristwatches / Important Collectors’ Wristwatches, Pocket Watches & Clocks
Geneva
Lot ID : 137
 
• CHF
• EUR
• USD
Sold :
• 88500
• 72207
• 101182
Estimation :
• 30000 - 50000
• 24477 - 40795
• 34299 - 57165


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1930's
Movement : Others
Caliber : 10 /
Case material : Yellow Gold
Dial color : Two-tone
Bracelet material : *leath*
Reference Detail : 2303
Thickness : 10.5 mm
Complications : Chronometre, Tachymetre


Ref. 2303, Single Button Chronograph.Rolex, Ref. 2303. Case No. 17890. Made in 1935, retailed by.Ronchi Milano..Very fine and extremely rare, small, 18K yellow gold wristwatch with co-axial.button chronograph, registers, tachometer and the original Rolex


Description : C. Two-body, brushed, concave lugs. D. Two-tone, Sector with printed baton.indexes and Arabic 6 and 12, outer minutes and fifth second divisions.subsidiary seconds and 30-minute register, outer tachometer. Blued steel.feuille hands. M. Cal. 10 1/2''', rhodium-plated, 17 jewels, straight line lever.escapement, monometallic balance, self-compensating Breguet balancespring..Index regulator..Dial, case and movement signed..Diam. 28.5 mm. Thickness 10.5 mm.

Ref. 2303, Single Button Chronograph.Rolex, Ref. 2303. Case No. 17890. Made in 1935, retailed by.Ronchi Milano..Very fine and extremely rare, small, 18K yellow gold wristwatch with co-axial.button chronograph, registers, tachometer and the original Rolex




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Movement : Others

Caliber : 10 /

Case material : Yellow Gold

Dial color : Two-tone

Bracelet material : *leath*

Reference Detail : 2303

Thickness : 10.5 mm

Complications : Chronometre, Tachymetre




Description : C. Two-body, brushed, concave lugs. D. Two-tone, Sector with printed baton.indexes and Arabic 6 and 12, outer minutes and fifth second divisions.subsidiary seconds and 30-minute register, outer tachometer. Blued steel.feuille hands. M. Cal. 10 1/2''', rhodium-plated, 17 jewels, straight line lever.escapement, monometallic balance, self-compensating Breguet balancespring..Index regulator..Dial, case and movement signed..Diam. 28.5 mm. Thickness 10.5 mm.


Sale date : 26/04/2004
Country : Hong Kong SAR China


Christies #2168 - 2004-04 - Important watches
Hong Kong
Lot ID : 1512
 
• HKD
• EUR
• USD
Sold :
• 113525
• 10422
• 14611
Estimation :
• 96000 - 140000
• 8813 - 12852
• 12355 - 18018


Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Period : 1930's
Watch ID : 14743
Case material : Yellow Gold
Case form : Barrel-shaped
Reference Detail : 2303
Complications : Chronometre


ROLEX. A RARE 18K GOLD SINGLE-BUTTON CHRONOGRAPH WRISTWATCH


Description : Lot Description.ROLEX. A RARE 18K GOLD SINGLE-BUTTON CHRONOGRAPH WRISTWATCH.Signed Rolex, Ref. 2303, No. 14743, circa 1935.With nickel-finished jewelled lever movement, the two-tone silvered dial with Breguet numerals, outer tachometric scale, blued steel hands, two subsidiary dials indicating constant seconds and 30 minutes register, the tonneau-shaped case with snap on back, chronograph operated through button in the crown, together with a gilt Rolex buckle, case, dial and movement signed.27 mm. diam..Special Notice.Prospective buyers are advised that we cannot arrange delivery of Corum, Rolex, Piaget or Franck Muller watches to the United States due to import restrictions. For further information please contact our specialists in charge of the sale.View Lot Notes ›

ROLEX. A RARE 18K GOLD SINGLE-BUTTON CHRONOGRAPH WRISTWATCH




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Period : 1930's

Watch ID : 14743

Case material : Yellow Gold

Case form : Barrel-shaped

Reference Detail : 2303

Complications : Chronometre




Description : Lot Description.ROLEX. A RARE 18K GOLD SINGLE-BUTTON CHRONOGRAPH WRISTWATCH.Signed Rolex, Ref. 2303, No. 14743, circa 1935.With nickel-finished jewelled lever movement, the two-tone silvered dial with Breguet numerals, outer tachometric scale, blued steel hands, two subsidiary dials indicating constant seconds and 30 minutes register, the tonneau-shaped case with snap on back, chronograph operated through button in the crown, together with a gilt Rolex buckle, case, dial and movement signed.27 mm. diam..Special Notice.Prospective buyers are advised that we cannot arrange delivery of Corum, Rolex, Piaget or Franck Muller watches to the United States due to import restrictions. For further information please contact our specialists in charge of the sale.View Lot Notes ›
Rolex : Rolex Chronographe
Sale date : 17/10/1992
Country : Switzerland


Antiquorum #140 - 1992-10 - Important Wristwatches, Watches & Clocks
Geneva
Lot ID : 175
Brand : Rolex
Model : Rolex Chronographe
Reference : Rolex - 2303


Category : Wrist Watch
Condition : Very good condition
Period : 1930's
Case material : Steel
Dial color : Silver
Reference Detail : 2303
Complications : Chronometre, Tachymetre


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Rolex, for Gobbi Milano, Ref. 2303, made in 1936.considered at the time as the smallest chronograph.in the world..Extremely fine and rare, small, stainless steel.gentleman's wristwatch with single button chronograph.register and tachometer.




Minimise description

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Brand : Rolex

Model : Rolex Chronographe

Reference : Rolex - 2303




Category : Wrist Watch

Condition : Very good condition

Period : 1930's

Case material : Steel

Dial color : Silver

Reference Detail : 2303

Complications : Chronometre, Tachymetre




Description : C. polished, satined. D. mat silver with painted Arabic.numerals and indexes + auxiliary seconds and 30.minutes register dials, outer tachometer graduation..Feuille blued steel hands. M. 10 1/2 ' rhodiumed, 17.jewels, lever escapement, monometallic balance, selfcompensating.Breguet balance-spring, the coaxial.single button on the winding-crown is for start-stop and.return to zero functions of the chronograph. Dial, case.and movement signed..In very good condition..Diam. 30 mm.