white gold, one in yellow gold, one in rose gold, and one in platinum. The yellow-gold and the white-gold Calibre 89 were sold at auctions by Antiquorum in 2009 and 2004, respectively, and both watches currently rank among the top ten most expensive watches ever sold at auction, with final prices over 5 million US dollars. 175th anniversary edition In 2014, Patek Philippe introduced the Grandmaster Chime Ref. 5175, the most complicated wristwatch ever built by the manufacturer (with 20 complications, but no tourbillon), to celebrate its 175th anniversary. Only seven pieces of Ref. 5175 were created, with one permanently residing in the Patek Philippe Museum in Geneva. The sale price for each of the other six pieces was 2.5 million CHF (2.6 million US dollars). In 2016, Patek Philippe introduced the Grandmaster Chime Ref. 6300, succeeding the Grandmaster Chime Ref. 5175. Ref. 6300 also has 20 complications, including grande sonnerie, minute repeater, and alarm with time strike (but without tourbillon), with the sale price over 2.2 million US dollars. The purchase of each piece requires an application from the buyer and has to be approved by Patek Philippe President Thierry Stern. See also Boule de Genève List of watch manufacturers Manufacture d'horlogerie Patek Philippe Henry Graves Supercomplication Patek Philippe Calibre 89 References Further reading Library of reference books on Patek Philippe watches and company - Patek Philippe website Kepa, Marek, "Watches for Royalty", Culture.pl, July 27, 2015 Liu, Ming, "At Patek Philippe, 'the D.N.A. Comes In'", The New York Times, March 17, 2016 Thompson, Joe, "Family Values: Patek Philippe’s Thierry and Philippe Stern", WatchTime Magazine, August 8, 2012 Walston, Oliver. "David and Goliath", Lusso magazine, August 8, 2009. Mazzardo, Alessandro. "History of the Patek Philippe Nautilus", Time and Watches, Dec 16, 2021. External links Manufacturing companies established in 1851 Swiss companies established in 1851 Swiss watch brands Luxury brands Watch manufacturing companies of Switzerland