The initial Royal Oak designs were being equipped with the calibre 2121 movement, which was based on the calibre 2120 formulated by Audemars Piguet in 1967, the whole world’s thinnest self-winding movement of the period with day indication, and an General peak of 3.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/