Replica Pre WWI Swiss Vetterli sling, all models, M1869, M1878, M1881.  The sling is black leather and has the adjustable buckle as well as the leather button holes on the other side.  Made just like the original, see the last two photos on Vetterli rifles. The sling is made of old leather, stock photo.  These slings are impossible to find original, so get an exact replica sling to make a nice addition to a rifle.