Help identifying this vintage Omega pocket watch

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Hello, i just got this old watches and found that they might have some value, but i dont know much about them so i am looking for help here.
I will be glad for every help with identification, what value they have or everything else about them.


I think they are made of silver but am not sure. I did some research and by the number on the movememt i found out they should be made in year 1920, but not sure. I also measured them and the outer diameter is 51mm and crystal diameter is 42mm