Photo Courtesy of Christie'sIn the biggest fashion news the luxury watch world has seen in years, one of the rarest timepieces will be up for auction at the upcoming Christie’s in Geneva on November 12. The watch in discussion is a Patek Philippe complicated timepiece made in the most valuable metals whose whereabouts were unknown for the last 25 years. After discovering that Eric Clapton was in possession of the watch, enthusiasts feared it would never appear publicly again— until it recently appeared in lot No. 151 at Christie’s Geneva. Originally made at the request of Patek owner and then president Philippe Stern, the watch is made even rarer due to the fact that only one other model exists in platinum, and it remains in the label’s museum in Geneva. Pre-sale estimates for the Patek Philippe perpetual calendar chronograph range from $2 million to $4 million.