age, and took over 10,000 hours of research and development. The Tour de l'lle wristwatch is one of the most complicated wristwatches in the world. In total, only seven pieces were manufactured, each of which had a sale price over US$1 million. On April 3, 2005, a Tour de I'lle wristwatch fetched a final price of 1.56 million US dollars (1,876,250 CHF) in Antiquorum's Geneva auction. The auctioned piece has a unique black dial. 260th anniversary edition In 2015, during the manufacturer's 260th anniversary, Vacheron Constantin revealed the world's most complicated mechanical watch, named Reference 57260. The pocket watch took three watchmakers eight years to build the 57-complication pocket watch at the request of a client. Vacheron Constantin would not disclose the exact price of this watch but did confirm that it was between 8 million and 20 million US dollars. The Reference 57260 is part of Vacheron Constantin's lineage of tailor-made grand complicated pocket watches since James W. Packard's pocket watch (1918), which was auctioned for US$1.763 million by Christie's in New York on June 15, 2011. In addition, the Vacheron Constantin pocket watch Ref. 402833 (1929), which was tailored for King Fuad I of Egypt, 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 1946, Vacheron Constantin tailored a complicated pocket watch for King Farouk of Egypt, the successor of King Fuad I, and in 1948 the company tailored another one for Count Guy de Boisrouvray of France. See also List of watch manufacturers Manufacture d'horlogerie The Vacheron Constantin Reference 57260 Tour de I'lle References External links Official Vacheron Constantin discussion forum Vacheron Constantin—The Oldest Watchmaking Company?—Disputing the fact that Vacheron Constantin is the oldest watchmaker Vacheron Constantin's Infinite Illusion Of Time: Les Univers Infinis Vacheron Constantin and the Art of Openworking 1755 establishments in Europe Swiss watch brands Watch manufacturing companies of Switzerland Luxury brands Richemont brands 18th-century establishments in Switzerland Companies established in 1755