What exactly was or is old greenbone as seen in old case knives? I've tried to research it, but mostly come up with current bright green colored knives. I have an old 1920's Case jacknife that is greenbone and I've seen alot of gorgeous old knives that are called greenbone. Was it a specific color of bone like redbone, or was it just a chestnut bone knife with pocket wear over time? I've seen some of the new pocketworn burnt brown bone knives and they look pretty close.