Gem Nation -- Glossary of Diamond, Jewelry and Watch Terminology 
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  O-ring
O-rings are used to seal the backs of watches which feature either a press-in back or a screw-in-back. They ensure water resistance. O-rings may also be used on the winding stems of watches and in the winding crowns to protect against the water and dust penetration. The o-ring is normally made from a rubber or plastic compound.
   
 

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