The first Royal Oak types have been fitted with the calibre 2121 movement, which was determined by the calibre 2120 designed by Audemars Piguet in 1967, the world’s thinnest self-winding motion with the period with day indicator, and an General top of three.05mm. The calibre 2121 was also Geared up https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/