The first Royal Oak versions have been equipped Using the calibre 2121 motion, which was according to the calibre 2120 developed by Audemars Piguet in 1967, the planet’s thinnest self-winding motion with the period with date indicator, and an overall top of 3.05mm. The calibre 2121 was also Outfitted by https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/