SubC's accuracy

[Mikegp]

Quick question. I've been tracking my subc accuracy for a few days. From Wednesday to Friday it gained 3 seconds, pretty good. But then from Friday to Saturday it gained 13 seconds. WTF?

I bought the watch pre owned from a fellow member and it was originally purchased a year ago.

Any thoughts?

[ecsub44]

What source are you using to check the time?

[Nidal]

Send to RSC to calibrate. Mine loses 4 seconds a MONTH

[padi56]

Originally Posted by Mikegp

Quick question. I've been tracking my subc accuracy for a few days. From Wednesday to Friday it gained 3 seconds, pretty good. But then from Friday to Saturday it gained 13 seconds. WTF?

I bought the watch pre owned from a fellow member and it was originally purchased a year ago.

Any thoughts?

A lot of things affect accuracy like the state of the power reserve in the mainspring different resting positions etc.The the COSC spec it that the movement should perform to a AVERAGE of between -4 to +6 seconds over any 24 hour period..Do not get to anal about accuracy and the only way to test correctly is over 5 complete days.First fully wind the watch 40 full crown turns clockwise only.Then set time with a reliable time source,for this test any quartz watch will do that's accurate enough.Wear as normal but for 8 hours plus a day,check time once daily with same setting force write down the loss or gain.Then average out the loss or gain over the 5 complete days for a accurate result.

[padi56]

Originally Posted by Nidal

Send to RSC to calibrate. Mine loses 4 seconds a MONTH

You must have a watch in a million to be as accurate as that.

[FTX I]

I got mine new and was a bit worried about that too. When I wear it at home, -1 -2, but then when I take to work and wear it the entire day + 10 +12. Im used to Omega Seamasters and never had anything close to that in terms of poor performance. Then I started reading about it and realised my case is not the only one and many Subs need a quick regulation to adjust it to the owner lifestyle. That said, mine is scheduled for regulation in 2 weeks. This fact was a nice contribution for me to renew the idea that Omega and Rolex are both great brands.

[Rolexitis]

I just had to have my subc regulated yesterday at an AD. Took him 10 minutes and was free. In my experience, the 3130 and 3135 have not been as accurate as my 3186 was. Just my personal experience based only on 3 watches. Mine has already been changing based on my activities. No biggie.

Sent from my SCH-I605 using Tapatalk 2

[landroverking]

My older DJ after service runs -2 to +2 over a week.
Not sure the older movents aren't better.

[Rolexitis]

And I prefer to be gaining rather than losing.

Sent from my SCH-I605 using Tapatalk 2

[77T]

Well your experience with a few measurements isn't the same as averaging over a week's time.

If doing Peter's routine doesn't yield a good result, then have it regulated.

[Archduke]

How long should a new watch be left to run in before fretting about accuracy?

[cop414]

My 14060M runs right at -.75 seconds per day. Keep in mind that as Peter said you need to be taking into account the average over a period of time.

[Old Expat Beast]

Originally Posted by padi56

You must have a watch in a million to be as accurate as that.

Mine gains about the same.

[Mikegp]

My local AD said they can't open the watch, they have to send it to a rolex service center and can't take up to 8 weeks. Ridiculous.

If I regulate it with a private watchmaker will that void the warranty?

[BBQ BOY]

Mine loses about 4 seconds every 24 hours if I put it on my night stand. I wear it about 15 hours a day and wind it every few days. I use time.is to check the accuracy. However, once I set it, it is VERY VERY accurate through the day. Down to the second and doesn't lose a second. But, laying it down drains the power.

[Rolexitis]

Originally Posted by Mikegp

My local AD said they can't open the watch, they have to send it to a rolex service center and can't take up to 8 weeks. Ridiculous.

If I regulate it with a private watchmaker will that void the warranty?

That's ridiculous. They must not be a service AD. Can you find another AD that offers service? As long as a private is an authorized Rolex repair person then it shouldn't void warranty. There is a local guy near me who carries Carl F Bucherer and Ball but he is an authorized Rolex repair guy as well as a master watch maker. He is from Switzerland. Go figure lol.

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[dbernard01]

I love these posts..... My thoughts are that if I need to be somewhere at an exact time, I'm in the wrong business. Hopefully those of us who wear these watches are in a position where people / events wait for us.

Just my .02

db

[Rolexitis]

Originally Posted by dbernard01

I love these posts..... My thoughts are that if I need to be somewhere at an exact time, I'm in the wrong business. Hopefully those of us who wear these watches are in a position where people / events wait for us.

Just my .02

db

Time waits for no man. :)

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[soaking.fused]

My SubC gains +1 second per day in a rotation of watches and/or on the winder. But should it be my daily wearer, it can be worn for weeks perfectly - gaining/losing zero seconds. Very good accuracy.


Sent from a guy wearing a watch.

[Old Expat Beast]

Originally Posted by dbernard01

I love these posts..... My thoughts are that if I need to be somewhere at an exact time, I'm in the wrong business. Hopefully those of us who wear these watches are in a position where people / events wait for us.

Just my .02

db

It's not about the time, it is about the accuracy. Nothing wrong with wanting to get the most from a movement that has taken over 100 years to perfect. Taking an interest in a fine watch's performance is part of the pleasure of owning it. Unless it's only a status symbol.

[Chainring]

Originally Posted by Old Expat Beast

It's not about the time, it is about the accuracy. Nothing wrong with wanting to get the most from a movement that has taken over 100 years to perfect. Taking an interest in a fine watch's performance is part of the pleasure of owning it. Unless it's only a status symbol.

[padi56]

Originally Posted by Mikegp

My local AD said they can't open the watch, they have to send it to a rolex service center and can't take up to 8 weeks. Ridiculous.

If I regulate it with a private watchmaker will that void the warranty?

Don't be in a hurry to get the back off your watch until you do a proper test on your watch,and if your watch does need regulating its a very simple task..Now regulation should take no longer than 30-40 minutes and that's with a pressure check after.But just because a movement has been regulated on a machine it don't mean it will perform exactly the same on the wrist.

[padi56]

Originally Posted by Old Expat Beast

It's not about the time, it is about the accuracy. Nothing wrong with wanting to get the most from a movement that has taken over 100 years to perfect. Taking an interest in a fine watch's performance is part of the pleasure of owning it. Unless it's only a status symbol.

Well even today most any modern day wristwatch chronometer are by the almost 300 year old 18th century navigational standards imposed on the English mans John Harrison H4 watch,quite laughably inaccurate even by today's COSC standards.How about just 5 seconds slow after 63 days at sea in one of the toughest environments known to man, not bad for a almost 300 year old watch.Now in those days no modern machinery no computer designs no robots,just his bare hands and crude tools.So next time when you look at your expensive Rolex watch and its only a few seconds out I hope it wont feel so bad what in a few seconds out of 86400 in a day anyway.Myself cannot be bothered with all this checking daily or even more for accuracy to the exact second. Last time I checked my wearing watch was almost two weeks ago then it was less than a minute fast that's accurate enough for me as my life is not run to the exact second.And I have never missed a bus train or plane or been late for any appointment because my watch might be a few seconds fast or slow either way..

[Steve748]

I have had two GMT2c and both of them were losing a second or two a day and they had not been serviced.
My current one is an '07 and I have just had it serviced and on my wrist it loses about half a second a day.
But when I lay it flat, face up overnight it gains about a second so I have managed to keep it -/+ a second a day by taking it off every other night or every 2nd night.

[fisherman79]

Originally Posted by padi56

You must have a watch in a million to be as accurate as that.

Indeed, its just not very likely for a mechanical watch to lose/gain only 4 sec a month.
Accuracy is affected by so many factors, it will never be the exactly the same.

[Mikegp]

I've been timing it for the last 5 days and it gained around 4 secs every 24 hours, except the second day when it gained 13 seconds. Weird. I'll keep observing it the next few days.

[padi56]

Originally Posted by Mikegp

I've been timing it for the last 5 days and it gained around 4 secs every 24 hours, except the second day when it gained 13 seconds. Weird. I'll keep observing it the next few days.

Well when they test the bare uncased movements at the COSC on the first 5 days of testing out of the 15 day test. The movement could vary by up to 15 seconds over 24 hours and still pass the COSC test.And are you sure of your testing and have not made a mistake or used a different time source.

[Tools]

Originally Posted by Mikegp

I've been timing it for the last 5 days and it gained around 4 secs every 24 hours, except the second day when it gained 13 seconds. Weird. I'll keep observing it the next few days.

An anomaly like this and I would suspect the time source if digital (or operator error) and not a mechanical movement. For it to physically "jump" 13 seconds for no reason is a difficult feat for such mechanics.

[adzman808]

the above is a snippet of me timing my sub

no gigantic 13 leap, but you can see it has it's moments....

look at the daily rate (calculated in weekly measurements)

0.x, 0.x, 0.x then 2.x & also -0.x

all well within CSOC and I'm not complaining about it but compared to my ETA 2824 movements which have been religiously +x every day every time its takes some getting used too

[Mikegp]

I use an app called Timestamp to check for accuracy, I've been doing it for the last year with different watches. At the moment I track my subc, my Explorer II and my speedy. Only the subc shows this behavior. I'll keep you guys posted