The initial Royal Oak models were equipped with the calibre 2121 motion, which was based upon the calibre 2120 developed by Audemars Piguet in 1967, the whole world’s thinnest self-winding motion on the era with date indicator, and an In general height of 3.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/