Awfully retro stuff you're asking about.
But, hey, I would have to say its a pretty cool knife pattern to own.
Blackjack! Blackjack! Yes, problem with the Blackjack A/F's has always been cracks developing on the lexan handles in later years. Sheath wasn't top material either. What's there to say? Other than its a keeper!
Dude! I would have thought you've seen this already?
http://blackjack.0catch.com/pages/af.htm
http://blackjack.0catch.com/pages/wickershamafarticle.htm