[Bestdj777]

That’s an interesting looking watch. What size is it? Markings for watches were a bit odd during WWII. Yours looks consistent in quality with the movements I’ve seen from that era but don’t know enough about Omegas to say one way or another. I’d recommend posting in on Rolexforums.com. It’s largely a Rolex site, but there is a wealth of knowledge about vintage watches and they should be able to say one way or another. A few points I will add though is, 1) there is no way a trench watch would be missing a back, so yours would have had at some point; 2) you may want to closely examine the dial as it is possible it was redone, leading the person to think it is fake; and 3) even if real, watches of that era are incredibly under appreciated and values just aren’t there—I got a WWI Rolex Trench watch with decent provenance but crappy markings for 1/8 the price of a new Datejust….