Seller says this measures 37mm across the case. Looks like it has been cased for some time. Serial is 443xxx, did Omega really make such big wrist watches back them. Also dial looks kinda cardboardy yet great condition. Is this one to embrace or run away from?
My familiarity with those ww1 era watches is limited but my 2 pennies is along the lines of @Gstp. The case doesn't seem right for that era. Is the dial enamel? If not - I'd look into it bc most of the watches I've seen from then were enamel. This one is circa 1916--
Not WW1 anyway. The plated case is more like 1930/40's, the hands are wrong and the dial dubious. If I were to guess Chips, I'd reckon the movement was fitted to a later case from a lower tier maker(check out how far the crown sticks out). Judging by the regulator said movement is in dire need of a service too. If someone was asking a hundred quid, I might go for it as a curio, but I'd not stump up any more than that. EDIT, I just noticed that the movement is for a pocket watch where the subdial would have been at 9 in this conversion(like many a "Ukrainian special"). If it was correct the balance wheel would be opposite the crown, hence they left the seconds hand out entirely.
I think a fair few early movements were recased in the 30-40s. It seems more prevalent in Europe. I picked up a very tired Longines, with a c.1917 movement, but in a later nickle plated case at a Spanish flea market. It was clearly done a very long time ago judging by the heavy patina. I would hazard a guess that this was a similar creation.