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