zOwie Omega Discussion Forum

Watchmakers time a watch using a timing machine that derives the rate from the variations in the beat frequency over a very short time. This rate can be quite different from what you find wearing it on your wrist over a full day. Case in point: my GMT had drifted to -12 sec/day over the 2 years I had it (by my calculations relative to time.gov). My local dealer happens to have an Omega-certified watchmaker who can do warranty repairs, so I took it in just before the warranty expired to be regulated.

The watchmaker put it on his machine, found it was drifting by -15 sec/day by his calulation and agreed to regulate it. He had it for 3 days doing the regulation and testing, and when he gave it back he included the report from the timing machine showing he had regulated it to +1 sec/day on average according to the machine. I thought this was great, and took it home to do my own real-world testing. Result: it has varied from about -3 sec/day to -1 sec/day.

I'm still happy with it, and won't be taking it back until I need the full servicing, but I think you might find that it is possible after regulating for it to be worse on your wrist than the timing machine would indicate.