Chronometer grade ETA 2824-2 movement main spring Nivaflex NM replacement?

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I've recently brought my watch with a chronometer grade ETA 2824-2 to service locally due to a sticky crown. I was unable to set the time easily and the crown is very tight when turning. The watch maker did a full service of the movement. While testing the running he told me that my watch power reserve is rather low, maybe about 30 hours when fully worn.

I did recalled the watch stopping after 29-30 hours after wearing it for the whole day. The watch maker told me he checked the main…

Chronometer grade ETA 2824-2 movement main spring Nivaflex NM replacement?

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