Quote:
Originally Posted by Mystro
Going that fast in that short of time has a magnetized feel about it. Then the mainspring not sticking to itself due to being not magnetized quite enough and freeing itself to a normal length would go back to normal. Thats my educated guess.
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If according to Rolex the hairspring is non magnetic which would be the main culprit if magnetised, and in general yes would speed up ,but not then slow down by same amount ,and it's got nothing to do with the mainspring.