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Chrono Creep question relating to my Seamaster

Z900rsdude
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Good Morning All from dark and dreary Dorset UK, I’ve been enjoying my vintage Seamaster 145.029 running the classic Moonwatch calibre 861. I’ve been giving it extensive wrist time and it holds excellent time(+/-4secs) but I’ve noticed that the Hour counter dial at 1800 seems to count when the chronograph isn’t running! I can reset it back to zero but it will start again sometimes.
Is this what’s known as Chrono creep and how does it occur and secondly how do I stop it.
Thanks in advance for your help

The photograph other photograph below shows the hour Chrono hand movement overnight, only 1 hour but it’s regular. If I reset now it will advance the hour again overtime. Niece reset, the Chrono works fine

Si
Edited:
 
87626E71-3562-4836-95AA-2DD22F363DAF.jpeg 4B87374E-54B1-4ADD-AC0D-8852859A9BF6.jpeg
watchyouwant
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Easy. Out of the case. Remove all hands. Remove the dial. Adjust the lever. The rest in reverse. Buy some good quality tools for that...... Think twice before you do that.
 
Z900rsdude
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watchyouwant watchyouwant
Easy. Out of the case. Remove all hands. Remove the dial. Adjust the lever. The rest in reverse. Buy some good quality tools for that...... Think twice before you do that.
I’m not a Horologist and that sounds a little complicated for me. So it’s an easy/cheap fix for a watch repairer/Horologist then?
 
jaguar11
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A service should sort it. Simon Freese or STS would be my port of call....
 
Z900rsdude
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Archer Archer
Please have a look at this thread:

The mysterious Speedmaster hour counter | Omega Forums

Cheers, Al
Thanks Archer, just read the post and VERY interesting relating to the independence of the hour marker over the elapsed seconds and minutes. So in essence it’s not a fault with Chrono creep it’s the hammer lock action not fully engaging am I correct??
What is the cure as the watch had the issue before my purchase and was fully serviced at £300 and had the creeping sorted. That was in December last year?
 
wsfarrell
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Make sure your watchmaker is aware of this issue, and get a specific warranty in writing. I've had three who failed to fix it. The last one, after two failed attempts, said "Well, that's just the way it is."
 
Archer
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Z900rsdude Z900rsdude
Thanks Archer, just read the post and VERY interesting relating to the independence of the hour marker over the elapsed seconds and minutes. So in essence it’s not a fault with Chrono creep it’s the hammer lock action not fully engaging am I correct??
What is the cure as the watch had the issue before my purchase and was fully serviced at £300 and had the creeping sorted. That was in December last year?

If you read that thread all the way through, you will see there are a number of reasons why the creep can occur. In my experience the misadjusted lock that everyone assumes is the problem, is rarely actually the problem. Usually just a good clean and proper lubrication will resolve it.

With yours creeping up to the 1 hour mark and not past that, my first thought would be worn teeth on the hour counting wheel. Once the worn teeth move far enough for the good teeth to contact the lock, the creeping stops. I've shown a photo of the teeth worn on the hour counting wheel.

No idea who did the service, but it should still have a warranty only after a few months, so I would talk to whoever did the service to let them know you want this repaired under warranty.

Cheers, Al
 
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