I just started collecting “Demo” knives. I had this one from 1986 and picked one up that was made by Camillus in 2003, shortly before they closed up shop. I also have a Queen Cutlery “Q 1986” Demo knife on the way.
Shoot, I used to have scads of those, they were in the Navy stock system, our supply guy would bring a half dozen back from the supply store rooms every now and then. A good "supply guy" (we called them the Repair Parts Petty Officer, RPPO for short), was worth his or her weight in gold! Don't believe I've ever seen a Queen version, please, when you get it, post a pic?
We'd get those TL29 Electricians Knives, too, mostly Camillus, but some other brands, too. I believe I've seen a Boker version, maybe Case, too.