The first Royal Oak designs were being equipped with the calibre 2121 motion, which was depending on the calibre 2120 developed by Audemars Piguet in 1967, the earth’s thinnest self-winding motion on the period with date sign, and an General height of 3.05mm. The calibre 2121 was also Geared up https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/