Omega Tissot Ref CK 679 Help

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I won this off ebay and have gotten the message that it has passed authenticity from ebay. I went to get Omega.com to obtain the extract and it seems the movement serial does not have enough numbers for Omega.
Here is the watch, can anyone help me out with where the seven digit serial would be?
https://www.ebay.com/itm/234670245089
Thanks in advance,
David
 
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It's a Tissot movement. Caliber 27 I think, which shares some parts with the Omega cal 26.5.

I'd like to see the markings inside the case back.
 
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That's because your watch is a Tissot, not an Omega. Both Tissot and Omega produced the "marine" in the 1930s, with the Tissot version using the double-signed Omega-Tissot brand. The Tissot movement is a caliber 19.4, commonly used in their ladies watches from that era.

Another Tissot marine is shown in this thread: https://omegaforums.net/threads/omega-marine.16385/
 
Posts
110
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119
That's because your watch is a Tissot, not an Omega. Both Tissot and Omega produced the "marine" in the 1930s, with the Tissot version using the double-signed Omega-Tissot brand. The Tissot movement is a caliber 19.4, commonly used in their ladies watches from that era.

Another Tissot marine is shown in this thread: https://omegaforums.net/threads/omega-marine.16385/
Hi and thanks for all the help, I don’t have it in hand yet but will get those other case back markings when I have it