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6300A sold for a hammer price of CHF 31-million today at Only Watch, a charity auction held in Geneva to which top watch brands donate special editions The previous record for the world's most expensive wristwatch was Paul Newman's Paul Newman Rolex Daytona, which sold for $17.7-million at a Phillips auction in 2017 The previous record for the world's most expensive watch was the Patek Philippe Henry Graves Jr.
Supercomplication, which sold for $24-million at a Sotheby's auction in 2014 The Grandmaster Chime reference 6300A-010 was created specially for Only Watch, and it is the only one that will ever be made in stainless steel The watch also has a chimed alarm function that strikes the time by reproducing the complete tone sequence of the minute repeater - a function never before integrated in a mechanical wristwatch.
It is the most complicated watch Patek Philippe has produced The Only Watch auction, held this year by Christie's, has been held biennially since 2005, with 100% of its proceeds going to benefit research on Duchenne muscular dystrophy, a genetic disorder that strikes children. Source