Mens Girard Perregaux Vintage 1945 King Size Perpetual Calendar Watch, 18kt white gold case (32mm length, 32mm width, 11.15mm thickness), crocodile leather strap with 18kt white gold buckle, off-white dial with silver hands and applied Arabic numerals, day/date/month perpetual calendar functions, moonphase indicator at 6 o'clock, 27 jewel GP #33Q0.D self-winding mechanical movement, scratch-resistant sapphire crystal, water-resistant to 30 meters.
The perpetual calendar mechanism enables the date display to take into account the different lengths of the months automatically, including leap years: it is a mechanism based on a cam, a so-called ?twelve-cam? (which completes one rotation every 12 months), and a wheel called the ?forty-eight? (which completes one rotation every forty-eight months, or four years) enabling the inclusion of 29th February, each leap year.
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