I agree, that it's not an Enfield leather sling.
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I have one that has been on a 1916 BSA since before 1949 it was my fathers range rifle.
Here are two leather slings plus a web sling on some early rifles.Attachment 124652
Yes. Back in the day rifle shooting came under the army. The rifle and sling had to be as issued a aperture sight was allowed no external padding on the coat, leather patches allowed on the elbows and the ROs turned a blind eye to the use of a cheek pad to allow cheek weld for the aperture sight.
RCS
Shows another type of sling i have as well.
BVZ24
Your buckle is wrong. The end of the sling folds back so the keeper holds the buckle flat like your belt.
B A R
They were used in Aussie in WW2 with 4 holes tied with leather thong/lace, as well . They are a little different to the Brit WW1 ones which i do have as well.
Bindi
I'm not quite understanding, can you post a picture?
It looks like the same straps I have on my Papworth Industry Military cases x 2 which sadly I can't photograph as they are in storage. Not for any rifle IMHO