The first Royal Oak models had been equipped With all the calibre 2121 motion, which was based on the calibre 2120 produced by Audemars Piguet in 1967, the earth’s thinnest self-winding movement with the era with date indicator, and an All round top of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/