I set my Aquatimer to atomic clock (time.gov) on Jan 1st, and today, on Feb 1st, it gained total of 6 seconds. All I did is to wear it everyday no matter what I'm doing (working, hiking, running, or even 4 hour go-kart race), and rested it crown down when I'm asleep. 6 seconds in 31 days, or in other words 0.2 seconds a day. The movement in this watch, Calibre 80111, is astonishing!
Bravo IWC. This is a keeper.
