Sorry for the slow response. No excuse, just too many hobbies.
The Knife is a Randall Made #24 Guardian.
Randall Made Knives >> Randall Made Knives Catalog
Some how I have collected one of each of these.
I don't think the grips on the 4" are original. I traded a Ruger Red Hawk for it at a gun show back in the 80's. The owner didn't know what he had and I didn't either until years later.
The 6" and 8 3/8" have the original boxes plus the...
I got this from Lew Horton in the mid 80's when I was in the sporting goods business. The original goncalo grips are put up. It's not pristine. I used to carry it until it finally dawned on me what would happen to what little hearing I have left if I had to use it w/o ear protectors. I had it...