Early Rotherhams wristwatch

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This high quality wristwatch was made by Rotherhams in England.

Which year is this case from?

Regards

Peter
 
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Thank you. My source, Pritchards book, was only reaching to 1920.

Interesting that such high quality wristwatrches still was produced by Rotherham 1931-32. I guess it was the final year...?
Edited:
 
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That's a beauty. Such beautiful preservation. How big is it?