Rare? That would be a Shaka single-edge fighter in L-6, made in a saw-sharpening shop in Zimbabwe in the early 90s. Also a sterile Peter Bauchop Witch fighter, from South Africa.
I have a Blackjack Magnum Camp Knife, with original Kenny Rowe pin-lock sheath. Not really rare, but definitely uncommon. This one would evolve into the Kabar/Becker BK-5. I also have one of those, but they are completely different knives.