The 1st Royal Oak models have been equipped with the calibre 2121 movement, which was according to the calibre 2120 developed by Audemars Piguet in 1967, the entire world’s thinnest self-winding motion of the period with date sign, and an Total top of 3.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/