The movement diameter is about 42mm and here is a close up of the rubies:
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I can't get a better photo of the engraving on the case but it's two 1's and an R. There's also an engraving that can be seen on the top right of the photo in the original post that says B9809 and some other hand carved letters and numbers on other parts of the case.
I found this watch yesterday at an antique store in the small town I live in in Spain, but the seller told me he gets his pocket watches from his friend that lives in France.
Thanks!
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