In 1860, Constant Girard-Perregaux was conducting research in the field of the Tourbillon escapement. The timepiece he created received a first-class prize from the Neuchatel Observatory. Its Tourbillon movement featured three parallel bridges. At SIHH 2010, Girard-Perregaux will unveil a limited edition of 50 Tourbillons with openworked versions of the gold bridges used in the original piece recognized by the Neuchatel Observatory.
The bridges are hollowed out, then 7 days of hand polishing is required to create the finish. The tourbillon also demands attention to detail. Its 72 components fit into a diameter of just one centimeter. It weighs 0.3 grams – about the same as a swan’s feather. The movement also features a self-winding system patented by the Manufacture: a small-diameter platinum oscillating weight is fitted in the space below and around the barrel. This leaves the movement’s dimensions and architecture intact. The movement is housed in a 41mm pink gold case that is curved to improve the fit on the wrist.
Pink gold case
Diameter: 41 mm
Case-back fastened with 6 screws
Water resistance: 30 metres
Girard-Perregaux GP9600C movement
Self-winding mechanical movement
Calibre: 32 mm
Frequency: 21,600 vibrations/hour (3 Hz)
Power reserve: minimum 48 hours
Functions: Tourbillon, hour, minute, small seconds on the Tourbillon
Alligator strap with deployant buckle
Limited and numbered edition of 50 pieces