zOwie Omega Discussion Forum

In late September, 2002, I bought a new Seamaster Pro. I manually wound, to make sure it was fully powered, it and started keeping track of its accuracy about three times a day. My normal wear pattern has the watch on my arm for 16 hours per day and I am moderately active. I suspect is stays fully wound.

Over the first couple of months, I was pleased to see that the watch was averaging just under +6 seconds per day, but frustrated to see that there was no position that caused it to slow (e.g. when stored at night). I have observed that the night gains seem to be least when the watch is stored DU.

I understand that the watch may slow some as it ages, but what I am finding is that it seems to be getting slightly faster. I September and October, the gains were 5 or 6 seconds. Now, average daily gains are 7 seconds. It’s winter here and I wonder if the lower temperatures are affecting the watch, even though I work indoors.

Last week, I took it off at 22:00 and put it back on at 10:30. I checked the time twelve hours later and was amazed to see a 13 second gain in 24 hours! The watch seems to gain much faster when the power reserve drops below 38 hours (i.e. when it sits for more than 6 hours).

I have done some experimenting and see that the watch runs best when worn all of the time. In the last 24 hours, I saw a 5 second gain.

So, should I return it for warranty service? Does winter weather cause 20% variation in accuracy? Are large gains normal when at or below 86% of full power reserve? I have not checked overnight position variances lately; do they change as a watch ages?

Thanks for your input.

Cheers,

Jay