Hard to say without a close up pic of the rear sight , they varied a lot during the early transitional years of the Lee Enfields . Yours should be sighted for 100 yards with the top of the front sight level with the top of the rear sight . The trouble with these old rifles is that they've been through many hands over the years so it's a bit of a crap shoot . Does yours still have the barley corn front sight , or is it a parallel sided blade ? The only way to be sure is to take the old girl out and shoot it . Heym SR20 gave some very good suggestions regarding targets and sight blacking . I actually use a commercial product , predictably called sight blacking lol , quite a lot as I shoot iron sighted rifles on a regular basis . Use a target that will allow you to aim at the bottom of a larger square , flat bottomed inverted triangle or T shape . You won't get an accurate idea of how well your rifle is shooting by aiming at the center of a large round target . I've also found that a medium blue coloured target is easier to focus on for some reason . It was shown to me by an old friend who shot on the Canadian Army Rifle team . It did make a difference , for me at least , especially in regards to eye strain . Long story short , take it out and enjoy yourself learning about a classic old rifle . Keep us posted . By the way , that's a really nice example of an older Lee , probably one of the better ones I've seen in a number of years , enjoy .
AB