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Is it commonplace for old alarm watches (50s & 60s) to have a hole on the back?

If so, does that make them more prone to getting dust/dirt inside.

 

Thanks

 

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Hi

Several early alarm watches had 2 piece case backs so as to create a resonance chamber, in order to amplify the alarm sound.

One of my 50's examples below show the watch assembly...

fIr6wHo.jpg

6EIqwI1.jpg

2s44FSa.jpg

The movement is still protected from the ingress of dust/dirt.

 

Hope this helps.

:thumbsup:

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