The initial Royal Oak versions were equipped with the calibre 2121 movement, which was based upon the calibre 2120 developed by Audemars Piguet in 1967, the whole world’s thinnest self-winding motion in the period with date sign, and an In general peak of three.05mm. The calibre 2121 was also equipped https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/