John Primble was a brand used by Belknap Hardware of Louisville, Kentucky, beginning in 1890...and lasting until 1986, when Blue Grass Cutlery bought the assets of Belknap at auction. Earlier knives were made by several companies such as Camillus, Schrade, and Boker. There are some recent reproductions both from the U.S.A. (Utica??) and more recently, possibly offshore.
Using Houston Price's book here.....
JOHN PRIMBLE
BELKNAP INC.
.....dates the knife between 1968-1986.
Guess: It makes little sense, but even though it is not marked Germany, that knife
looks like a Boker Congress with the extended, stepped bolsters and circular shield......
http://www.eknifeworks.com/webapp/eComm ... BK70113135
But, I can't prove that wild, irrational guess, as it looks a bit like a Queen as well.
Bill