I've had a proper look today and yes, after removing the button it doubles back through the buckle and seems a good length to fit quite nicely on a Mauser i tested with it. The marking does look like its a faded 'SA' in a square with a "T" shape under, made of a greenish webbing from what i think is maybe cotton. It measures about 1200mm (around 47ish inches). Was originally going to put it on a Mauser but i've got a Finnishicon M39 waiting on a PTA it probably wouldn't look too out of place on.

Thanks for your input guys, much appreciated with my limited knowledge at the moment!
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