The very first Royal Oak styles were fitted While using the calibre 2121 motion, which was dependant on the calibre 2120 designed by Audemars Piguet in 1967, the world’s thinnest self-winding motion of the period with day indicator, and an All round peak of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/