Top quality Asia Automatic Movement (21 Jewel) With Smooth Sweeping Seconds Hand Fully Functional Day-Month-Military time chronograph dials Solid 316 Stainless Steel CaseHigh quality genuine Leather Strap Mineral crystal scratch durable glass face Water-Resistant Man Size: 38mmPatek Philippe was established in 1851 between Antoine Patek and Jean A Philippe. In 1863 they invented the 'free mainspring' that lead to the invention of the automatic watch. The 'split second' chronograph is patented by Patek in 1902. Fifty of the fifty-three highest prices ever paid for watches at auction were Patek Phillipe.