The Reference 57260 is a single highly complicated mechanical pocket watch displaying the Gregorian, Judaic, and lunar calendars featuring 57 complications. The watch was assembled by Vacheron Constantin and introduced in 2015. The company announced that it was the most complicated mechanical pocket watch ever created at the time, succeeding the Patek Philippe Calibre 89, assembled in 1989 and featuring 33 complications. The Reference 57260 took eight years to assemble. The watch has 2,826 parts and 31 hands, weighs 957 grams (33.8 oz) and has a diameter of 98 millimetres (3.9 in).
The Reference 57260 is one of Vacheron Constantin's tailor-made pocket watches with grand complications. Members of the lineage include James W. Packard's minute repeating pocket watch (1918), which was auctioned for US$1.763 million by Christie's in New York on 15 June 2011, and King Fuad I's pocket watch No. 402833 (1929), which ranks as one of the most expensive watches ever sold at auction, fetching US$2.77 million (3,306,250 CHF) in Geneva on April 3, 2005. In addition, in 1946 Vacheron Constantin made a customized pocket watch for King Farouk of Egypt, the successor of King Fuad I, and in 1948 the company tailored another pocket watch for Count Guy de Boisrouvray of France.
Price
The price agreed between the company and the client is confidential and has not been officially disclosed; however, various sources estimate the price to be in excess of $US10 million. It was built for a single customer, whose details are kept confidential and is only described as "A major watch collector".
Technical specifications
Reference: 57260/000G-B046
Material: White gold
Diameter: 98 mm
Thickness: 50.55 mm
Caliber: 3750
Diameter: 72 mm
Thickness: 36 mm
Number of components: Over 2,800
Number of jewels: 242
Frequency: 2.5 Hz / 18,000 vibrations per hour
Power reserve: 60 hours
Number of complications: 57
Fifty-seven complications by function
Time measurement (6 functions)
Hours, minutes, seconds, average solar time (regulator)