The room at Sotheby's Geneva auction house erupted into wild cheering and applause as auctioneer and consultant Aurel Bacs, who spent most of the sale consulting somebody by phone, secured the Graves Supercomplication pocket watch for $24 million, making

The room at Sotheby's Geneva auction house erupted into wild cheering and applause as auctioneer and consultant Aurel Bacs, who spent most of the sale consulting somebody by phone, secured the Graves Supercomplication pocket watch for $24 million, making it the most valuable timepiece in auction history.