The primary Royal Oak styles were fitted with the calibre 2121 motion, which was based upon the calibre 2120 produced by Audemars Piguet in 1967, the planet’s thinnest self-winding movement of your era with day sign, and an In general height of three.05mm. The calibre 2121 was also Outfitted using https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/