I believe this is it. It has an nny marking though I don't know if the others do 100%. Also the M75 designation may be the key to identifying them. These are advertised with JG Sales in case you want to see their disclaimer and info.
There was some Yugo m75 in brown boxes too. It is from the late eighties. I got a mixed batch of it when I ordered it from SportsmansGuide. I took it out to the range, and paired it against some P635 German ball ammo from 1939, and yes the German beat it! I did get one dud in the German in 7 boxes, but other than that, beat the Yugo in accuracy hands down. Headstamps were P635 45 L. 39, and also 48 L. 39. The German brass ammo that J&G had a few years back was the best buy of the 8mm glut we had for the last ten years of so!