NABS has this old girl pretty well pegged, I would think.
Without doubt, she saw service in both World Wars, and possibly on three or more continents before being "retired"..... and shipped off to the Colonies (us) on a fourth continent.
That nose cap is interesting in that it is cleaned out that far and also has no serial number. I`m wondering if it has a letter "H" stamped on it, in which case it might be a souvenir of Australia as they did make a Heavy Barrel at one time and this might have come from a Heavy Barreled rifle. If it is marked thus, doubtless somebody will buy the nosecap for enough $$ to buy you a couple withOUT the "H".
But Nabs is quite right: mostly cosmetic work required. Bit of DRY fine-grade steelwool for the rusted bits, followed by a dab of oil. New nose cap. Perhaps repair that forward handguard some time; it doesn`t touch the barrel during firing, so it makes no real difference to how she shoots. Make sure all the parts are there and done up RIGHT, which does not necessarily mean TIGHT (Magpie Screw is a case in point: you can actually use it for fine adjustment of your vertical zero). Give her a good bath and some TLC: your girl IS 95 years old and she has earned a bit of respect. Then you take her to dinner.
My twin to yours has stated a definite preference insofar as dining is concerned. She likes Defence Industries brass (made in Canada from 1941 through 1945 only, headstamp "DI Z date") with standard Large Rifle primers and 37 grains of 4895 powder. The Sierra Pro-Hunter 180 flatbase bullet is seated to the OAL of a standard Mark VII Ball round, which pushes the bullet forward toward the leade just a bit. This load gives you about 2250 feet per second in an SMLE, which is right where the factory determined that the best accuracy could be obtained. Don`t waste your money on bat-tailed bullets: the SMLE almost always shoots its best with a flatbase.
Pop on over to milsurps dot com and download a couple of (free) books:
SHOOT TO LIVE (Canadian WW2 rifle marksmanship course based on the Number 4 but SMLE owners also can benefit from it, and.....
a Manual for your rifle. There were several versions of this but I am thinking that the easiest might be the one from 1942. It is called (most imaginatively) "RIFLE - 1942" and has between its covers complete instructions regarding how to get the most fun out of your SMLE.
Nice thing about the SMLE: there are more and more commemorative-type matches all the time. I expect that this will be an upward trend over the next two to seven years. For matches such as these, the SMLE s the Perfect Rile.
Hope this helps.
.