The very first Royal Oak styles were equipped with the calibre 2121 movement, which was based on the calibre 2120 produced by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement from the period with day 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/