Mens Girard Perregaux Fly-Back Chronograph Watch, 18kt rose gold case (40mm diameter, 12.4mm thickness) see-through sapphire crystal caseback, crocodile leather strap with 18kt rose gold buckle, white dial with luminous rose gold hands and applied rose gold hour markers, date calendar between 4 and 5 o'clock, 63 jewel GP #337A self-winding mechanical movement with chronograph functions, scratch-resistant sapphire crystal, water-resistant to 30 meters.

The fly-back function, which was created at the request of aviation pioneers, means that the chronograph can be instantly re-set to zero and restarted without pushing a stop button. Thus saving precious time : it makes it quicker to calculate time during holding patterns or to change flight paths. Pressing once the push-piece replaces the traditional sequence of operations: stop - return to zero - start.