Based off some descriptions on my some listings, some labeled as a pry bar or screwdriver. I've seen these go for a crazy amount of money for a sharpener. Especially considering most are in used conditions and after 30-40 years, depending on the usage, I'd wager a significant portion of the carbide might have been depleted from the stone.
As for the Klein version, if I remember correctly this was made in England and discontinued some time ago.