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Question re: so called "break in period"

My understanding is that each individual movement undergoes extensive testing which it must pass to become a COSC approved chronometer. Having said that, I have read more than a few posts here from people saying their chronometers are running out of tolerance. The usual explanation given for this by fellow posters is the watch is still in its "break in" period.

What I'm having trouble understanding is this. If a watch passes the COSC tests and then subsequently begins running out of tolerance it would seem to me there is an honest to goodness problem with the watch. If the movement has already passed certification (and the extremely rigorous testing associated with it), how and why would it lapse out of tolerance for a while (as much as a few months according to some of the posts here) and then back into tolerance after this so called "break in" period?

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Question re: so called "break in period"

Re: Question re: so called "break in period"

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1 wallclock secs ( 0.17 usr + 0.03 sys = 0.20 CPU)