My guess on this one is much like marts' ....
Looks like a Usa , Japan knife , prob 1960's , with simulated plastic 'horn' .
Seems as if someone took a wirewheel to it too ...
The "USA" brand was put on many (cheaply produced) items post WW2 (for items intended to be exported) & many Americans were fooled by the mark .
This was during the epoch when times were pretty tough in Japan & resentment and bias still existed en mass , in the U.S.A. (things made in Japan were regarded as inferior & cheap) .
Today , new things with such marks would have to be (legally) sold as "fantasy items" ... pretty sure there are collectors of USA stuff though !
Not worth much to a knife collector , since it's condition seems to be poor , IMO , cutnshoot84 .