Regulation Accuracy +0.5 sec/day
 

I don't own a Rolex to keep perfect time, if I wanted that I would wear my Casio G-Shock quartz with "atomic" timekeeping.

However, I was surprised after a recent regulation of the accuracy of my GMT Master II 16710. They got it to +0.454s per day (+60.5 sec after 128.2 days or 4.3 months). This is with the watch worn normally, no winding, and no laying it down in any of the positions to speed up or slow it down.

This is a 2007 watch with 3185 movement. so the COSC is -4/+6 sec/day. As you know, Rolex went to a COSC of +/- 2sec/day later on.

I did not use a timegrapher, but rather a simple (but highly recommended) iOS app "Watch Tracker". It relies on your accuracy of pressing a button when the second hand sweeps over the hour marker, but it's going to be pretty accurate over time.

I made sure the watch was not magnetized, the amplitude is 239 - 280 depending on the position of the watch, and considering 270 - 310 is a good range, it's hanging in there. The watch had a one full servicing in 2017.

Not bad for 28,800 vibrations per hour.
How about your experience? Comments welcome.

Impressive.

Most impressive.

Pretty much ideal. Most all of my automatic movements can do under 2 seconds a day on the wrist and optimal night resting position. What’s even more impressive is my old TT Bluesy did +2 to +4 a day for 15 years without any routine service. I didn’t even have to service it at the 15 year mark since its accuracy was still so consistent. It lived its life constantly on a watch winder or my wrist.

Pretty amazing that a mechanical watch can keep such accurate time.

Speaking for myself never been anal about checking my watches to the exact second in over 50 years of owning and wearing many Rolex watches.And have found 10,15,30,31,and 32 series movements to be accurate within a few seconds out of 86400 in a day.But your watch is showing great accuracy just wear it in good health now that's far more important.

Excellent! My 2023 Sub is fast 1.2 seconds/day. Not as good as yours but I'll take it. :cheers:

:rofl:

Regulation Accuracy +0.5 sec/day
 

Nice result.

My new-to-me 2017 3135 is better regulated than my (now sold) 3235. 24/7 wear on both watches.

3235 was within +2/-2 (so can't complain) before it got sick, though it was unfortunately edging towards -2, would prefer +2 if had to pick. After "Movement check" it was regulated fast (closer to Omega 0/+4).

Regulation Accuracy +0.5 sec/day
 

I have three with the new movement. One is running at -1 spd, one is + 1 spd, and the third is 0 spd. I have a Timegrapher and checked them all, just a few weeks ago. No complaints here.

Kat


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FWIW I found this the other day...

Having size and file size issues when uploading. Just incase you cannot read the test, it is below -

SIMPLE REGULATING
If your watch loses or gains a few seconds per day (remember there are 86,400 seconds in 24 hours !), you can correct it without expert aid.
The rate of a watch varies slightly depending upon its position. Take it off at night and place it as follows:
To gain a few seconds: Lay the watch flat with the dial uppermost.
2. To lose a few seconds: Lay the watch vertically with the winding-button downwards.
3. To lose rather more seconds: Lay the watch vertically with the winding-button uppermost.

I am not sure what watch or movement this relates to.

That's quite old now was first out with the 15 and 30 series movements yes different resting positions might loose gain a second or so this is why they are still tested at COSC in 5 positions and different temperatures to a AVERAGE -4+6 seconds to get the Swiss chronometer certification.

Regulation Accuracy +0.5 sec/day
 

I don’t keep track of accuracy so much. I rarely set my watches to the exact second. But one time I set my Submariner 114060 in sync with my G-Shock, and a week later, the Sub and G-Shock read the exact same time. So the Sub—after one week—kept up with the G-Shock.

I took a picture. Both read 10:21 and 41 seconds.

https://uploads.tapatalk-cdn.com/202...c52bc281ee.jpg


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As long as you keep accuracy expectations metered and don’t let OCD ruin the automatic watch experience, a very accurate movement is always more interesting to own. I find it fun to keep track of how long it will stay in that 0 to +2 zone and it can be for months. A timegrapher doesn’t tell the whole story because on the wrist the movements and temp changes can greatly change a static timegrapher reading.

It’s like owning a Steinway or classic acoustic guitar that stays in tune for a ridiculously long time even when played a lot.

So, help me here...brain challenged...

If the watch is running at -2 to - 4 daily, that means each day it will lose these seconds and, after 28-30 days (or so) it will be a full minute behind?

TIA,

Ben

That is correct. The accuracy in sec is per day.

That's crazy good accuracy, impressive

Very impressive :thumbsup:

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Very happy with wife's and my accuracy of our watches. My wife had only one issue with here DJ36, it started to move up to +1min/d too fast. Sent it to RSC last July and they fixed it, but it is still the fastest one of all our references. But I don't want to start again the 32xx discussion here ))