Screw off Gasket measurement

Choosing the correct size

round gasket / o-ring.

 
The gasket is positioned in a channel that runs around the case
of the watch under the back case cover, you need to take the
inside and outside of this channel from one side of the case to
the other this should give you the correct size gasket.
 
Recommendation use a pair of digital callipers to take the measurements

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