The initial Royal Oak models have been equipped With all the calibre 2121 movement, which was based upon the calibre 2120 produced by Audemars Piguet in 1967, the whole world’s thinnest self-winding motion in the period with date indication, and an All round peak of 3.05mm. The calibre 2121 was https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/