The primary Royal Oak designs were being equipped with the calibre 2121 motion, which was according to the calibre 2120 made by Audemars Piguet in 1967, the whole world’s thinnest self-winding movement of the era with date indication, and an In general height of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/