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: I had a similar problem about a month after I bought my 300M GMT
: Co-axial. It stopped running after wearing it every day. I sent
: it back to the Omega Service Center, fixed it (took about six
: weeks), and the only response I got back that this is a known
: problem with the first generation co-axials.
: Does anybody else know anything more about this problem with the
: co-axial? From looking around the Web, it does not appear to be
: a widespread issue.
: - JR
There are three versions of the calibre 2500 - A, B and C. The A version was used only in the first limited and numbered Deville Co-axials; your watch does not have one.
The GMT version is the calibre 2528, of which there are A and B versions.
2500B is the same calibre as 2528A, which has a GMT module on it.
2500C is the same calibre as 2528B.
The 2500B and 2528A have a known issue with failing to start after setting. These calibres beat at 28,800 or 8 ticks per second. I have a Deville 2500B, and it sometimes exhibits this issue. Rather than having the watch serviced, I simply look at the watch after I set it and first put it on to ensure it is running. A light tap or shake of the wrist is all that is required.
Omega changed the 2500C and 2528B to beat at 25,600 or 7 beats per second, which is closer to the ideal frequency for the coaxial escapement (I'm told), making it a better timekeeper, more reliable and stable. I have a Deville GMT 2528B and it has no issues.
See these one second exposures to see the difference in my two very similar watches.
2528B with 7 beats per second 2500B with 8 beats per second
2528B with 7 beats per second 2500B with 8 beats per second
Rather than servicing your watch (and any 8 beats per second movements), I understand Omega often replaced the movements with the more stable 7 beats per second version. Very few people notice the difference, and timekeeping usually improves.
If you are curious, take a one second exposure of your second hand and count the beats. One of your photographer friends would relish the challenge if you don't have the time and equipment.
I strongly suspect you have (now) a 7 beats per second watch.
Other than this issue (where Omega did not follow the advice of the inventor of the coaxial escapement, George Daniels, to use 7 beats per second from the start), I am aware of no other issues. As with most new technologies coming to market, there were a few missteps along the way.
Sam aka Hewybaby
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