Your Sling is an Izzy (Israeli). I had one just like it but traded it to Sht_le for something else to go on his Izzy 98k. The symbol in the circle on the buckle is Hebrew but I am not sure what it says.
I would also agree that the Sight hood looks a bit funky, or rather the front sight base does- According to Backbone of the Wehrmacht by Richard Law, the 1940 /42 K98 should not have a front sight hood(see page 156)- Could have been added later- Was that sling on the rifle when you go it? Perhaps the rifle has seen some time in Israeli service and picked up the hood there.