Frederique Constant Highlife Tourbillon Perpetual Calendar Manufacture (Reference fc-975N4NH9) This watch combines two of the most sophisticated complications in watchmaking. The tourbillon allows the balance wheel to rotate within a rotating cage, thereby compensating for positional errors in timekeeping. The perpetual calendar automatically accounts for varying month lengths and leap years. The in-house caliber FC-975 is self-winding and offers a 38-hour power reserve. The yellow gold case measures 41 mm; sapphire crystal protects the dial, and the watch is water-resistant to 30 meters. The alligator leather strap fastens with a pin buckle. This model is offered as a certified pre-owned watch. Its authenticity and condition have been carefully verified by our watch experts. We will be happy to provide you with the exact contents of the package upon request.