Quote:
Originally Posted by padi56
All mechanical watches when the mainspring runs down could loose a few seconds, but we are only talking about a few seconds and not minutes or hours. All mechanical watches run better and more accurate when the mainspring is at peak power -reserve. So even when worn will do no harm whatsoever to give a manual wind once a week or so.
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That's a key issue with a watch that has a low amplitude at full wind, even though it keeps good time in that condition (e.g. mine). When my power reserve gets low, it crosses an amplitude threshold where the timing goes to complete crap. I've seen it go to -160 s/d in this situation. So this new amazing "70 hour power reserve" is kind of nonsense if I have to make sure it never uses more than 50 hours of it or else the timing drifts like crazy.
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