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I recently learned that some watches have a "screw-down crown", which to my understanding is made with a threaded crown stem that tightens into a threaded watch case. This seems inconvenient because a user has to loosen the crown, which can be hard to do if the crown is small or if the user's fingers are big, before it can be used for setting the time.

Some watches have similar water resistance ratings, for example, 100 meters, without the need for a screw-down crown. Obviously gaskets under the crown can help achieve some level of water resistance and combining a screw-down crown with gaskets would be even more water resistant. Also obviously, gaskets probably have a life shorter than most of the other components in a watch.

What other kinds of crowns are there that achieve substantial water resistance without relying on either a screw-down crown or gaskets under the crown?

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  • $\begingroup$ I always thought that water resistance meant an ability to withstand splashes of water, whereas water proofing of watches meant the ability to be submerged to a specific depth. $\endgroup$
    – Fred
    Oct 12, 2022 at 18:37

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"water resistant" rating is one thing.

"Diver" rating to 200m or more is different and my watch has a screw-down crown as well. The complete construction is more solid for a diving rated watch as they are subjected to greater pressures - pressure increases with increasing depth.

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