The first Royal Oak styles were fitted While using the calibre 2121 movement, which was according to the calibre 2120 designed by Audemars Piguet in 1967, the whole world’s thinnest self-winding movement of the era with date indicator, and an All round height of three.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/