Help w/ finishing my papaw collection. Imperial Frontier #4311

[ezrahenderson]

As the title suggests am trying to help my papaw finish the last knife needed in his collection and it's been a tough hard find. I've only ever found one listing that was sold and I have the manufacturer description to go off. I am looking for a VINTAGE IMPERIAL FRONTIER POCKET KNIFE No.4311 SINGLE BLADE MADE IN USA if you have one or know how to help me I will pay for this Knife. It's a single blade scag handle from 1976 with model no. 4311

Attached are some photos for reference