What is your most accurate mechanical watch?

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Faz Faz
It's a tie...
The Longines and GMT are a few seconds fast per day.
My all watches run few seconds fast per day!!馃榿
 
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Pun Pun
My all watches run few seconds fast per day!!馃榿
Ok, ok ....."a few" = 5 secs or less 馃槤 馃槈
 
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Datejust. I think it gains about 1.2 seconds a day.
My skx013 seems pretty spot on too, but I haven鈥檛 sat and checked it.
 
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Man, Rolex needs to bring back dauphine hands... that would be a really neat watch without those boring old stick hands.
 
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My DSOTM is on an amazing run. I set it to the atomic clock two and a half weeks ago and it has only gained one second since, which is better than my quartz watches! Most of the time I've owned the DSOTM (2 years) it's been running at +1 sec/day, but it seems to have hit a really sweet spot recently. It won't last, but pretty remarkable as long as it does.
 
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My BSotM is my most accurate mechanical.

Based on position every 24 hours: (only track those I use)
- Dial Up: About 1 to 1.5 seconds, not timed it precisely.
- Crown Up: Pretty close to 0 from what I've noticed.
- Worn: Usually -0.5 to -1.0 seconds.

So my pattern is, if worn for several days (i.e. weekend) then I might leave it dial up during the work day to catch up. If it's where I want it (usually a bit fast to compensate for periods worn) then I leave it crown up to keep it neutral. Once I figured out the patterns I reverted to checking it against an atomic clock every 5-7 days or so. I always sleep with a watch on as well.