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Gaskets are vital, but I wonder if screwdown crowns make much difference. My Grand Seiko with pull-out crown has the same 100m WR as a Rolex Oyster. Come to think of it, my G-Shock has twice the WR of a Rolex Oyster, with four non-screwdown pushers and a plastic case with thin steel caseback held on by four tiny screws.
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