Quote:
Originally Posted by Ascari_2
When a movement is magnetized the components that is typically effected the most (and has the most prominent effect on the watch's ability to tell time) is the hairspring. Basically a magnetized hairspring cannot unwind fully and this causes the balance to oscillate quicker than it would otherwise. As a result, a magnetized watch generally tends to run faster and not slower.
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True. However, the hairspring on a modern Rolex is very unlikely to magnetize. According to a watchmaker I spoke with, only some of the minor parts within the movement are made of metals that can be magnetized. When that happens, the results 1) will be less pronounced and 2) gain or loss of time.
What's interesting, that I read elsewhere, is that this causes additional strain on these parts, as they're fighting the magnetic field created. That's where I started to wonder whether that was responsible for the premature ware on the seconds wheel pivot that one of our resident watchmakers showed us in another thread.