1933 Henry Graves 'supercomplication' pocket watch, Patek Philippe
Sold for: $11 million at Sotheby's in 1999
Part of the legendary Henry Graves collection, the Supercomplication is the result of a race between Graves and his contemporary, James Ward Packard, to own the most complicated - with the most number of mechanical functions - watch. The watch took three years to build, and possesses 24 complications. It's also the most expensive watch ever sold at an auction.
Image courtesy: Reuters
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