The very first Royal Oak models ended up equipped with the calibre 2121 movement, which was based upon the calibre 2120 formulated by Audemars Piguet in 1967, the entire world’s thinnest self-winding motion from the period with date indication, and an All round top of three.05mm. The calibre 2121 was https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/