Enfield number 5 Mk 1 Bayonet help

[Aragorn243]

I was able to get the grips off of it last night after letting it sit with some Rem Oil on the screws. As I feared, the reason for the gap in the hand guard was a build up of rust. I got that off of it and put the hand guard back on. The gap is still there but it is a uniform 1/16th of an inch rather than the tapered large gap. I could see rust in there through the gap and thought that might be the problem. Grips are heavily oil soaked and must have trapped moisture in there.

I don't have a big issue with the paint other than it looks like it was put on by hand and I'd like to find the makers mark. There doesn't appear to be any rust forming under the paint and that's my main issue. I don't like rust much, want to control it as much as feasible.

Any ideas of what the large three digit number is? Unit, partial serial???