I recently found a pocket knife while clearing my grandmother's house. It has 2 blades the larger of which has colonial prov on the base. It also looks like R N next to that. I assume this knife is quite old and possibly collectible? It has an inlaid piece of metal on outer case also. Not sure what outer case is made of ? Ivory/bone?? I can send some photos too. Oh and I'm in Ayrshire, Scotland.