Hello everyone, and a 6b/159 question

Hi everyone

I'm new here and contemplating my first proper Omega purchase, and i'm currently looking at a 6b/159, which after a bit of research is looking more like it's the real thing, it's just I have one small problem with it, the fact that it doesn't have any Air Ministry engraving on the rear of the case.
I've read all the stories about people removing the numbers after the war for whatever reason, but I've also read that None of these watches left Air Ministry stores without those numbers on them.
I suppose what I'm really asking is, how concerned should I be that they are missing on the watch that I'm looking at.
Any help would be very much appreciated.
Thanks for looking
Paul

Genuine issue engravings put circa 40% on the price.

Thanks guys for your opinions, I have to say that I've been thinking very much what you pointed out.
Saying that, there were a lot more, better pics of the watch on the listing although none of the interior which I did ask for, but was given an excuse, although it is listed as having the correct movement, but I would very much like to see serial numbers etc.
So, I think we have a big NO on this one, but I very much appreciate all your inputs.