1956 Omega Cal. 267 Ref. 2900-4: Gaskets & Crystal Q&A

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Hi,
I have a 1956 Cal 267 omega with case 2900-4 snap on case back.
My questions are;
Did they have gaskets in the crown/pipe and caseback?
Did they have omega symbol on the crystal for these pieces?
Pictures are of the case back, bezel and crystal that was in it.
Thank you

 
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I don’t think this was a waterproof watch. As far as I’ve seen the case backs were marked with “Fit washer in back” or something similar if they needed a gasket.