I bought this Case Classic at least 20 years ago. ‘Prototype’ and ‘bark ivory’ are engraved on the blade. Presumably it was made from ‘pre-1989 ivory’ and is ‘1 of 1’. I paid a chunk of change (for a poor slob like me) & threw it into my knife sack. I also bought a few other Case Classic knives over the years that were sold to me as prototypes & salesman’s samples that (I hope) had genuine pre-ban ivory handles. I checked for authenticity the best I could with the tools & information available to me at the time. Ironically or stupidly enough, I was a Case dealer (very small time) at the time & I can’t recall contacting Case & inquiring. Anyone have any idea about Case making a few prototype Classics with elephant & other exotic handle materials when they were making Classics? I have a few elephant ivory, mastodon ivory, and a fair number of apple, red, and tiger coral handled Classcs purchased over a several year period when I temporarily took leave of my sanity & gathered a sack of knives that I fancied, such as Al Mars, Hattoris, Randalls, before the prices got crazy & they became unavailable altogether seemingly. I have no idea where to get valid information about these >20 & <50 yr old knives. Some of the stories I read on line of people being victims of con artists & then possibly unwittingly conning someone else when they resell their knives bothers me. I also wonder if the rider placed on my insurance policy is insuring a sack of toy knives. Maybe I need to go ahead and burn the place down NOW and beg for an insurance payout (& prison), rather than defraud some future buyer and get sent to the crossbar hotel for THAT. Six of one and half dozen of the other I guess. Lol.