The initial Royal Oak styles have been fitted With all the calibre 2121 movement, which was based upon the calibre 2120 formulated by Audemars Piguet in 1967, the earth’s thinnest self-winding motion of your period with day indicator, and an All round height of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/