İs there any omega vintage with no logo in back case?

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İ just got this Omega. İnside back case there is no omega logo. İt fits perfect and seems fine. But i have never seen one with no logo. Can it be not original🙁 ? Help pls
 
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It's a contract case made by S&W, Schwab & Wuispard Case Co, New York USA.

Do you have a movement photo?
 
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55
It's a contract case made by S&W, Schwab & Wuispard Case Co, New York USA.

Do you have a movement photo?
Soooo it is original and normal having no logo in case back😀
 
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Seems totally correct for one of this vintage, ca 1936.