So I'm going to throw this out again for whatever it's worth, right or wrong.
I bought my first Randall Model 1-6 in 1967. Carbon, stag, and etched Michael R. Allen. In 1970, I flew to Tampa to see my brother,and took my knife to the Randall shop. Pete and I visited for a good while regarding western hunting, and then asked me if I would like rivets on my sheath. I said sure. He went in the back a a few minutes later, I had rivets on my brown button sheath. I sold that knife and sheath to Rhett in 1993 and tried to find it, but no luck. My blade was carbon, stag and etched Michael R. Allen, if you find it, let me know.

Pap