The very first Royal Oak types were equipped With all the calibre 2121 movement, which was based upon the calibre 2120 developed by Audemars Piguet in 1967, the whole world’s thinnest self-winding motion from the era with date indication, and an All round peak of 3.05mm. The calibre 2121 was https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/