The 1st Royal Oak styles were being equipped with the calibre 2121 movement, which was according to the calibre 2120 designed by Audemars Piguet in 1967, the planet’s thinnest self-winding motion from the era with date indication, and an Over-all top of three.05mm. The calibre 2121 was also Outfitted by https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/