Vintage Omega Jumbo help

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Need some insight on this Jumbo I aquired .
I will try to provide a serial number to date it and a ref number (I think it’s a 2181?) tomorrow as iam having a heck of a time getting the back off.
So the usual obvious questions about the dial etc.
Whatever you can tell me would be greatly appreciated .
First thing is there is no Swiss Made at the 6,but I have seen a very similar jumbo without one somewhere on the net claiming it was original so…
The crystal has no etched logo but I think this is a pre 1950?
Again will confirm date with serial once I get the back off hopefully tomorrow .
For now here are some pics thanks in advance