Need to confirm authenticity

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Hello everyone, I just purchased this omega but I’m not sure about the model nor the year of manufacturing. I went through some other forums and it seems to be dated between 1920-23 based on movement and case SN. I believe it to be a 23.7 but I’m not sure.
I also would like if someone can confirm the authenticity based on the pictures. Thank you in advance!

 
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Hi,

The pics are not the best, but everything looks good, except the second hand, which is a replacement or is broken. Not sure about the crown, but it looks genuine. The movement looks like a cal. 23.7 indeed, but a front image would help. I cannot see the small hallmarks on the inner part of the case.

Cheers,
François