All About Pocket Knives

A work associate of mine is trying to locate a replacenent gor a Case fixed blade knife that he calls an "office knife" He bought one that looks like it on Amazon, but of course, it is inferior.
I'm looking for a Case model number based on similarities to his Amazon knife. Any ideas?

X17-3 Desk Knife, where the X designates the handle material
https://casexx.com/Library/Secret.asp
scroll down a bit for the handle material designation