Omega calibre 19 CHRO questions

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Hi!
A good friend of mine has just acquired this nice 19 chro. Apparently it must be for the German market circa 1900 and most likely the serial number is located under the dial. From what he has been able to see its quality must be Bs, but those rubies on the chronograph module might make it cs quality. You were struck by the unusual position of the micro-regulator and the shape of the chrono's hammer, which may have been modified?

Thank you very much in advance for your help and I hope you like it.

PS the final jewel count would be 19/20 rubies?

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