Riesch has it just like above with the 1943 instead of BOYT -43-
If the Slings Web Weave looks correct,
Color like stated above: Tan / Khaki,
Length is 37 inches,
The loop is 2 inches long at the Lift The Dot end (Loop Closed).
And has Swaged on D tips.....
You might have a WWII Era, Made for the US Marine Corps Reising Submachine Gun Sling ?
If it fits on a Carbine I could see it being used.
But I don't know anymore than what I just read.
Question now is..... Is the Authors information correct ? IDK
I've seen and own US Navy packs that are WWII with D tip ends.
I own WWII Era M1Carbine cleaning rods / kit with smaller versions of a D tip strap