The initial Royal Oak styles were fitted with the calibre 2121 movement, which was based upon the calibre 2120 formulated by Audemars Piguet in 1967, the globe’s thinnest self-winding movement with the period with date sign, and an Total height of three.05mm. The calibre 2121 was also Geared up which https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/