All About Pocket Knives

I need to know if anyone can tell me what the difference is in bone and rogers bone?
Also I know a little about the number system that case uses.
Example of 64052 I know that the 6 is handle material , 4 is number of blades and 52 is the Congres pattern but what is the 0? I know 6 is bone ( but sometimes Delrin). Is the 0 telling that the 6 in this case is Delrin? I am somewhat confused.

Thanks in advance for any help I can get.

an "0" generally mean there is change in the original pattern, barehead as opposed to bolstered, etc. roger's bone was prepared by the rogers co. it was dark red to green. one of the suppliers to case and other cutlers. somebody correct me if i'm wrong.

This is early Rogers Bone. Click pic a couple times.

Stockman

ok , great , thanks guys.