The very first Royal Oak models were equipped With all the calibre 2121 motion, which was determined by the calibre 2120 made by Audemars Piguet in 1967, the world’s thinnest self-winding motion with the era with day sign, and an General height of three.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/