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There are o-rings and seals around pusher stems in the same way there are seals >>>

April 16 2017 at 9:19 PM

Gary  (Login gfriedell)
High Heid Yin
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Response to Good question...

On the crown stems of water resistant watches whose crowns are not screw down.

But as was mentioned, you would expect the water resistance to be less effective than a watch that uses a screw down or other device to supply pressure against the seals.

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