Rolex goes a step beyond COSC with their Superlative Chronometer certification. While I hate they splash it all over the dial, 100% of the movements they make

Rolex goes a step beyond COSC with their Superlative Chronometer certification. While I hate they splash it all over the dial, 100% of the movements they make are certified to +2/-2 seconds per day. That even includes the new Air King, which historically hasn't been chronometer certified and why it was always the lowest cost Rolex. Even the Tudor in house movements are being COSC certified now. Tudor has always used the highest grade ETA movements which can be COSC certified but never bothered to. Now the new movements they are making themselves are going in for testing. Mechanical watches will never be as accurate as a good quartz watch, that is an indisputable fact. On the other hand, telling the time with nothing but springs and gears has an analogue magic that delights me every time I wear one of my mechanical watches. When I spend the day surrounded by integrated circuits and batteries it's really relaxing to have something nearby that is disconnected and simple.