The 1st Royal Oak versions had been equipped With all the calibre 2121 movement, which was based upon the calibre 2120 made by Audemars Piguet in 1967, the entire world’s thinnest self-winding motion from the era with day sign, and an Over-all top of three.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/