I have 3 knives made by Case that I bought in the 80's. 2 of them have two different types of smooth bone on the handles. The first is a Case XX A6235-1/2, I believe the handle colors are the same on both sides, this one has been used on a ranch. The second one is a Case XX one dot Barlow number A62009-1/2. This one has never been used and lastly is my little knife I keep in my purse. It's a Case XX USA 7 dot A6225-1/2, with two different colored side smooth handles. Any information on how to clean that one, value and name would be appreciated. Also, are the two with different types of bone in the handles salesman samples?