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Zenith watch, is it necessary to open the case back.

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Hi all,


I've purchased a Zenith Chronomaster Open watch, wore it everyday. It ran slow 30-40s a month. And the manufacturer gave a gift for club member during birthdays, you need to use it at the end of this year. This gift is maintenance for the watch.


There are including:
Waterproof test.
Replace the gasket.
Clean the band and case.
Check the spring


But I was confused that the watch send to maintenance in good condition. So please enlighten me. Thanks for any help.

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