Girard Perregaux Vintage 1945 Mens Brown Strap Black Dial 18K Rose Gold Automatic Perpetual Calendar Moon Phase Watch

Girard Perregaux Vintage 1945 Mens Brown Strap Watch

Girard Perregaux Vintage 1945 Mens Brown Strap Watch, 18K rose gold case, brown crocdile leather strap with a deployant buckle, black dial with gold hands and gold applied arabic numerals, day of the week subdial displayed at the 9 o’clock, month at the 12 o’clock and the date at the 3 o’clock, a moon phase is displayed at the 6 o’clock, water resistant to 30 meters, automatic GP movement 33Q0.D, Caliber 11 ½”’, Frequency 28.800 Vibr./h (4 Hz), 27 jewels, power reserve min. 50 hours, see-through case-back fastened with 4 screws.

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.