Quote:
Originally Posted by No SUBctitute
I have a 3135 sub that has averaged about +1.5 second per day for more than a decade. I hadn't checked the accuracy for a few years, but it now seems to be almost dead on. It has not been serviced.
Assuming that nothing more than normal wear and tear is happening to a movement (and it has not undergone anything traumatic), is it more usual for the 3135 to slow down or speed up over time? Or are either just as equally likely to happen?
To clarify, I am perfectly happy with my watch the way it is--I am not asking about my watch specifically. I was just curious as to how a 3135 usually behaves as it ages. Or if there is no "usual."
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Gravity affects mechanical watches the most that's why they are tested in to AVERAGE -4+ 6 seconds in 5 different positions and temperatures at Swiss COSC. And in those different positions there always will be slight deviations in the timekeeping. Remember this the escapement of a mechanical watch in 24 hours pushes the gears 432,000 times. But on the wrist wearing given the fact that the movement is constantly affected by the earth's gravity, metal expansion and contraction, different temperature variations, mainspring power reserve, subtle changes in lubrication and friction, shocks, and so on. The fact is that no mechanical watch made will keep 100% perfect time, very close yes but perfect no, your watch is fine and in spec so don't worry about. But seeing watch is now like you state 10 years old start to budget for a full RSC service in the next few months or so but no rush at the moment.