The initial Royal Oak designs were fitted With all the calibre 2121 motion, which was based on the calibre 2120 developed by Audemars Piguet in 1967, the planet’s thinnest self-winding movement of your period with day indicator, and an Over-all height of three.05mm. The calibre 2121 was also Geared up https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/