The initial Royal Oak styles were fitted With all the calibre 2121 motion, which was according to the calibre 2120 formulated by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement with the era with date sign, and an All round height of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/