Here's a couple of Jerry Halfrich Prototype Knives that I have been fortunate enough to acquire, from an exceptionally talented maker & a really great guy to boot. Blades CPM154, Liners 416SS, Lockback is natural stag and the slippie is real amber stag, 4 ¼ closed, 7 9/16 OAL. Both are stamped with the "P" for prototype.