Gents Patek Philippe Perpetual Calendar in 18k yellow gold with a unique factory original long mesh bracelet to fit a wrist up to an 8 3/8 inch. Auto w/ date, day, month, moonphase and perpetual calendar. Comes with Archive papers. Ref 3945/001J. Circa 1987. Fine Pre-owned Patek Philippe Watch. Certified preowned Patek Philippe Perpetual Calendar 3945/001J watch is made out of yellow gold on a Gold Mesh band with a 18k Two Piece buckle. This Patek Philippe watch has a 36 mm case with a Round caseback and Cream 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.