The very first Royal Oak types were being fitted with the calibre 2121 motion, which was dependant on the calibre 2120 made by Audemars Piguet in 1967, the world’s thinnest self-winding motion in the period with date indication, and an overall height of three.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/