After the watch was sold for this staggering sum in '99, it was unclear to many where it actually went. All we knew is that it was clearly not with the Patek Philippe museum. Then, in November of 2012, Bloomberg published an article revealing that a member of the Qatari Royal Family owed Sotheby's $83 million. And, he would be letting go of some of his most prized collectibles to pay down that debt – including the Henry Graves Supercomplication. But, just because Sotheby's would take possession of this watch by no means was it to be assumed we'd definitely see the world's most valuable watch up for auction again. It very easily could have been sold privately to a top client, but as of this morning it's official – the Graves Supercomplication will be at auction this November.

The sale of important watches by Sotheby's will take place in Geneva on November 14th, and will coincide with the 175th anniversary of Patek Philippe, who, we can assume, will be announcing a relatively large and important new watch around the same time. The estimate this time around? 15 million Swiss.

More on this one as we get closer to the sale.