zOwie Omega Discussion Forum

: However
: on 2 occasions there has been a problem: In
: late december I noticed one day that the
: watch was 90 minutes late. I always wear the
: watch (usually night time as well) but on
: this occasion I had taken it off for about 3
: hours. I reset it and subsequently it run to
: the same accuracy as before until 2 days
: ago.

: Again after taking it off for 2 hours or so
: noticed the watch was 45 minutes late (I
: know as a fact it was right on time a few
: hours earlier). I reset it to the correct
: time and monitored it but noticed it was
: losing 2 minutes an hour. I decided to
: manually rewind it (about 15 turns before I
: hear the click) and since then it has been
: running beautifuly.

: Many thanks

: Tom

Well, you may have self-diagnosed the issue. Someone who does not move their arm a great deal may not ever get their watch fully wound. The 2500C co-axial movement is very accurate throughout the "power curve", a quality known as isochronocity.

If your motion does not keep the watch fully wound, but only at 10-15% power (4-5 hours), it is certainly possible for it to run accurately while worn and then relatively quickly run down.

However, it is also a distinct possibility the winding mechanism is not working well and requires servicing. Your watch should still be under warranty. Take it to the Authorized Dealer and ask them to diagnose the watch.

If you have access to the watchmaker, ask him to measure the amplitude (an indirect measure of how fully wound) when you first come in. That will give you an idea if your arm motion is keeping the watch wound.

Good luck

Sam