The very first Royal Oak versions have been equipped With all the calibre 2121 motion, which was dependant on the calibre 2120 formulated by Audemars Piguet in 1967, the earth’s thinnest self-winding motion in the era with date indicator, and an overall height of three.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/