A few questions regarding replaceable blades

[Daz]

Are these the old cam-loks with orange ferrules and black blades that are retained with dual spiral clips?

If they are, there is a reason they haven't been sold for what i guess to be almost 30 years (they sold a boat-load of them in the mid 80's to kids like me and others who didn't know any better).

Ferrules that bend, blades that shed on impact if they don't break, and a conical point that impedes penetration.