Jaeger-leCoultre Reverso Classic Small Duetto, Руководство пользователя

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The “1000 Hours Control” legend, or the “ ”
seal engraved on the back of the watch certifies
that each of the models from our collection has
successfully undergone all of the qualification
tests, and that your watch has successfully
undergone all of the production tests. These
ensure regularity of rate, resistance to variations
in temperature and atmospheric pressure,
ability to withstand shocks and magnetic fields,
as well as water resistance