Vintage and rare CASE XX Red Bone handle 6296X \"Citrus Tester\" folding pocket knife with stainless steel blades.

This knife belonged to my Father and was part of his collection of pocket knives.It has been carried and sharpened and is in very nice condition with no cracks or chips in the red bone handles. The rivets are all tight and the blades have a nice firm snap. The long blade is tight but the small bladeis a slight bit loose. Also there is some sort of residue or possible discoloration of the bolsters and rivets on one end (please see photo). Ihave not attempted to clean the knife as I didn\'t want to risk damage to the bone handles. However, I believe that someone with experienceshould be able to clean it.