Patek Philippe Nautilus Ref 5711/1A-010. Steel case, diameter 40mm. Water resistant to 120 meters. Automatic 324 S C caliber movement, Parts: 213. Bridges: 6. Jewels: 29. Power reserve: Min. 35 hours – max. 45 hours. Central rotor in 21K gold, unidirectional winding. Balance: Gyromax®. Vibrations/hour: 28 800 (4 Hz). Balance spring: Spiromax®. Hallmark: Patek Philippe Seal. Black-blue dial, gold applied hour markers with luminescent coating, date display at 3, centre second sweep. Brushed steel and polished bracelet. Box and papers dated January 2018.