Rolex accuracy

[T. Ferguson]

Originally Posted by DJJon

NO NO NO NO

2 seconds out per day is 99.998% accurate ! ! !

Ooopsy, I must have been spell checking my words when I should have been checking my numbers. Meant to type 99.9%. Thanks for the correction.

[Athas]

If you worry about a few seconds here or there per day you have too much time on your hands

[joe100]

A computer will be nearly spot on. A Rolex, with many dozen moving parts is 99.9% accurate for years at a time. I'll take the Rolex.

[Czechman]

Originally Posted by Armyguy03

I set my SS Sub to time.gov on 18DEC12 at 1934. 18 Days later (I just checked), my watch is 32 seconds fast. So, I gained a 0.5625 seconds per day

Actually your watch gained 1.78 sec per day. That's 32 divided by 18, not the other way around.





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[padi56]

Originally Posted by connorperson

Those arent quite the standards -4/+6

if you look that is what the watch should be at the worst

at its best it should be +/-1

see http://www.chronocentric.com/watches/accuracy.shtml

Those are just words and yes it could be possible with very care regulation to get some movements to perform +/- 1 seconds a day when tested with the machine.But on the wrist it could be totally different and does it real make that much difference to anyones life if one watch is +1 or -2,+3,-4,+5,+6 out of 86400 in a day.When the bare uncased movements are tested at the COSC after the 15 day test the movement is certified passed if it performs to a average of between -4 to +6 seconds over a 24 hour period nothing more.And certification is only for the time of testing it does not guarantee the movement will perform like that for the next 20-50 years.But Rolex will do its best at normal routine service to regulate it back within the COSC spec.

The term "Superlative Chronometer" is a now trademark of Rolex. The addition of the word "Superlative" in front of the official designation of Chronometer is merely a Rolex marketing angle to give a more distinguished sound to the chronometer status of their products . As all watches that have earned the privilege of bearing the official Swiss designation of "Chronometer" have to meet the exact same C.O.S.C. standards. Any words added before or after the official designation of "Chronometer" are merely fluff which Rolex sometimes is very good at.There are not any different grades or levels of chronometer certification,for movements of Rolex size .

Below is a chart of the testing at the COSC the first column relates to Rolex as you can see.Now in the first ten days of testing the movement could vary by up to 10 seconds in 24 hours and still pass the test.

[Venusfly]

Originally Posted by T. Ferguson

A watch that is 2 seconds a day off (+-) is 99.8% accurate. In all seriousness, if that's not acceptable then a mechanical watch is not for you.

If you have a Rolex that is not running within COSC spec it can be regulated to do so.

X2

[Mystro]

Out of all the different brands of automatics I have talked to on many forums, most everyone I talk to would like their automatic to run +2 a day. +2 seems to be the common goal to reach or wish for on their new watch. Slightly fast is way more desirable than even a tiny bit slow. It's funny because most use the logic that its easier to pull the stem out to reset a fast movement and most would prefer a buffer in their time piece so they are never late. A slow watch regardless how slow, gives the idea that it will make you late.....Just about any quality movement can cut COSC in half these days.

[connorperson]

Standards



http://www.chronocentric.com/watches/accuracy.shtml

[jerseyden]

As long as it does not cause me to miss my flight I really am not bothered about a minute here or there.

[gmtm2]

cosc! +6 - 4

[brazil420sh]

My new 216570 is running -6sec / 24hr. Could anyone tell me about how long does it take for a watchmaker to regulate it?

Thanks!

[padi56]

Originally Posted by brazil420sh

My new 216570 is running -6sec / 24hr. Could anyone tell me about how long does it take for a watchmaker to regulate it?

Thanks!

Give the watch around two months first to settle in and try and keep watches power reserve at maximum.Have you given your watch a full manual wind if not 40 full crown turns clockwise only and try below.

[VADanno]

I just tried leaving my watch crown down last night. When I set it crystal-up, it ends up 8 seconds fast. This morning, it was only 4 seconds fast. I will try it all week, and then try it crown down for a week. Thanks for posting the "self-tune" directions.

[beshannon]

Mine run within COSC spec, I do not measure my life by the second

[brazil420sh]

Originally Posted by padi56

Give the watch around two months first to settle in and try and keep watches power reserve at maximum.Have you given your watch a full manual wind if not 40 full crown turns clockwise only and try below.

Thank you for your kind insight. It is possible to attach that photo without using imageshack? I am currently in mainland China (behind the great firewall) and cannot access it.

[padi56]

To gain rest watch flat dial up to lose rest watch vertical crown down,to lose more rest vertical crown up but we are only talking about a few seconds and does not always work on the modern day Rolex.

[gpfps]

I think we are lucky to have a rolex run -4 +6 AVERAGE . I read a lot of watch mags and the higher end watches and those radial designed types seems never to mention acc. reports.

[VADanno]

Originally Posted by esm

have you ever been late to a meeting/missed a flight because your Rolex was not accurate?

No, but I did fire someone for being late to a meeting. I questioned later whether my Rolex was off, as it gains 8 seconds a day when placed crystal up at night. It was not off by the three minutes she was late. And she had just been written up earlier in the week AND the VP Ops was the presenter at the meeting.

Since then I have reset the watch every morning when I come into the office. On travel days, I just stop the watch for 8 seconds. Also, I am testing different "resting" positions, and I'm within COSC (+4) when I store the watch crown down at night. Next week I will try crown up.

[chh47gmt]

My first GMT, a 1675 that I bought at a PX in Vietnam in 1969 was -20 per day brand new! It must have been pining for the higher, cooler, and drier air of Switzerland! So I mailed it to the Rolex service in Calif and got it back two months later. It was now at -4
per day, just barely making back into COSC specs. Fast forward 44 years, and my 5 year old but new (to me) GMT 16710 with 3186 movement is -4 per day. So I'm picking up where I left off, but I will be visiting my local AD to see if we can do even better this time!

[Paulo100]

My 30 year old DD Pres, is -2 seconds per day. I am very happy with that. (Serviced once since new).

[gwozhog]

Like I tell my 7 year old son in Mathematics if you are 1 number off you are wrong Period! If you are looking for an accurate watch Rolex may not be the brand for you.
Although the watch should get you going pretty close to being on time where ever you need to go.