[bdgfate]

Too narrow I think for SVT38 or 40, and the end straps are squared off (another PPSh sling trait). I'd vote for early PPSh-41 sling.

Vic or SSWikinger would probably know the answer.

 

[bdgfate]

With the way things were mixed and matched in the field during WWII, that sling on your SVT would not be out of place.