Is this knife unused/factory sharp blade, mint?
No ,it is an old knife . Blades are " full" ,meaning not sharpened away . But more than likely it has been used and carried and sharpened I do not know the vintage of when it was built . Perhaps theres a Remington knife expert here?
I did show it once to a Remington collector he said in this condition they bring around $150 If I had to guess I'd say 1940's or 1950's
Not mint ,no box ,used carried ,excellent condition for it's age