Horological repair, restoration and machining

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Final comments- Water resistance is determined in laboratory conditions at a specific depth / pressure.

Keep your use in line with the ratings of the watch. Remember the watch is tested in still water; swimming and diving increases pressure dramatically.  Avoid temperature extremes or shocks.  Accidental exposure is one thing; hot tubs, saunas and the like are a no-no. Chemicals work their way into watch cases, gaskets and bands and starts corrosion which leads to premature failure.

Have your watch checked regularly for water resistance

Divers - I do not recommend using a mechanical watch as a dive watch.  Use a dive computer or other instrument specific to the task, your life depends on it.  If you use a mechanical watch rated for diving have it checked regularly at the manufacturer’s service center or a professional dive shop..
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Watch repair
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Water resistance - Summary