As late as 1953, Patek Philippe presented his first automatic winding. Calibre 12 600 AT comes with a guilloché finished, gold rotor. It is regarded the most superb winding of its kind. In the following two decades Patek Philippe pioneered in the development of electronic techniques. Whether in watches or in official precision time measurement, the technical standards of Patek Philippe are of the highest class since 1839.
A survey of the most popular watch with this caliber, the legendary Ref. 2526