New version of the most known Patek Philippe complication: the ultra thin self-winding Perpetual Calendar, now in yellow gold. The timeless classic design of the original Ref. 3940 case and dial first introduced in the mid 1980's has been kept and adapted in a larger more contemporary size with a diameter of 37,20mm (instead of 36 mm). The elegance of the ultra thin case is enhanced by a slightly new enlarged size. The new Ref. 5140 replaces the Ref. 3940.
Ultra-thin mechanical self-winding movement
Perpetual calendar: day, date, month, leap year by hands
Moon phases and am/pm indicators
Opaline-white dial, gold applied hour markers
Interchangeable full back and sapphire crystal case back
Water resistant to 30 m
Case diameter: 37.2 mm
Self-Winding Movement. The self-winding caliber 240 movement is coveted for the elegance of its layout and its extremely compact design. The movement's 22K. gold mini-rotor, situated in an off-center position, has a large mass despite its unusually small diameter. The inlaid design of the rotor made it possible to reduce the height of the movement to 2.53 millimeters. A skeleton version of the movement is also available (240 SQU). To craft it profoundly challenges the artistry and skill of our watchmakers, because all carving and beveling are done entirely by hand.
Perpetual calendar: Day, date, month, leap year by hands
Moon phases and am/pm indicator
Overall diameter: 27.5 mm
Height: 3.88 mm
27 jewels, 8 bridges
Vibrations per hour: 21,600
Power reserve: 48 h max
Number of parts: 275
Information courtesy of the Patek Philippe website.