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@pdlouche
Forgot all about the tiny diver. Wound it and it no longer beats five hours fast - probably was magnetised. Instead now the hands don't move, then swing loose a by five minutes when tapped. After that it almost keeps time.
Would be eternally grateful once back in the UK if a resident expert put it on the pile to pull apart and put back together some time.
Hairsping and balance wheel is not damaged by visual inspection, probably as previously suggested that something is loose inside.