All things considered, I'd just call Jim. Google him or SARCO for the number. He will likely remember and you can pass the info along to us after you visit with him. He is a super nice guy and I'll bet he remembers the detail. It will take guesswork out of the answer.
EDIT: Josey,, After looking that knife over, I am going to speculate it was made for Jim by Colonial in the 'Old Cutler' series that Colonial put out. That was an excellent line of knives from Colonial.