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.