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373 . Patek Philippe
An extremely fine , highly important and previously unknown pink gold worldtime wristwatch with two crowns and two-tone dial
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Manufacturer Patek Philippe Year 1954
Reference No . 2523 / 1 Movement No . 724 ’ 317 Case No . 313 ’ 051 Material 18k pink gold Calibre Mechanical , 12 ’’’ 400 HU , 18 jewels
Bracelet / Strap Black crocodile leather strap
Clasp / Buckle 18k pink gold Patek
Philippe buckle Dimensions 36 mm . diameter Signed
Case , dial and movement signed
Estimate HKD 12,000,000-20,000,000 USD 1,500,000-2,500,000
Accessories With Patek Philippe Extract from the Archives confirming production of the movement of the present watch was manufactured in 1954 , completed in 1965 and encased in 1966 , and its subsequent sale on 17 May 1973 .
Literature For another example of a reference 2523 / 1 cased in pink gold , please see Patek Philippe Museum , Patek Philippe Watches Volume II , page 346 .
The World Time system was first invented in 1935 by master watchmaker Louis Cottier . At the time , the movement was used by watchmakers such as Patek Philippe , Rolex , and Vacheron Constantin . The ingenious system allowed the wearer to view multiple time zones . The dial was fitted with two discs , which could be easily adjusted to change and compare the time of various cities around the world . Reference 2523 was fitted with an additional crown at 9 o ’ clock to change time zones .