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Magnetism is one cause but I have been told by more than one industry person that if the watch (the balance spring specifically) is magnetised, the watch will always run faster, not slower.
I had a Seiko with a 6R that ran really well, until it suddenly didn’t. That started running a lot slower, and the watch wasn’t magnetised as far as I could tell - at least, using a degausser made no difference, and being a divers watch it had a degree of magnetic resistance built in. Seiko fixed it under warranty, which I believe for the 6R is simply swapping the whole movement out for a replacement one.
Regal
PawG
Thanks,
Yep there is European warranty card in the box but its blank not stamped or filled in
Out of interest what can cause watch go dramatically slower, I remember reading in this tread
similar problem with Seiko couple of years ago if not mistaken