Gents Patek Philippe Calatrava in 18k rose gold on leather strap, snap-on case back, 18 jewels, thickness 7 mm. Manual with subseconds. Ref 3923. Reference 3923 was launched in 1986 and belongs to the Calatrava collection. This model bears the calibre 215PS and its production ceased in 1999. Original box and papers. Fine Pre-owned Patek Philippe Watch. Certified preowned Patek Philippe Calatrava 3923 watch on a Brown Leather strap with a 18k rose gold tang buckle. This Patek Philippe watch has a 31.5 x 31.5 mm case with a Round caseback and Ivory Stick dial. It is Gray and Sons Certified Authentic and comes backed by our 12-month warranty. Each watch is inspected by our certified in-house Swiss-trained watchmakers before shipment including final servicing, cleaning, and polishing. If you have inquiries about this Patek Philippe Calatrava watch please call us toll free at 800-918-2608 and be sure to reference W518604.