This Patek Philippe Ref# 3923 Stainless Steel is from 1987 and comes with an original period box and Extract from the Archives. This example has recently been fully serviced by Patek Philippe in 2018 and is under a 2 year warranty. The 3923 manual wind watch features a 31.5 mm case. This is a stainless steel example with silver dial and stainless steel buckle. Functions include hours, minutes, and seconds. Reference 3923 was launched in 1986 and belongs to the Calatrava collection. Its production ceased in 1999.