I think we are just going to have to call all of them Camillus Contract Bucks. With the demise of Cami and unless one of the folks that worked at Camillus and actually assembled these visit the Camillus forum and answer, we may never know the detail truths. I think we need to compare them with the same design built for other companies and see what the rivet patterns are. Knives with lighter colored bone are apparently 'assembled' knives of some manner. First run originals, are almost always dark, uniform colored jigged bone. My Delrin version is only one number different from the early jigged bone version, yet the rivet pattern is different. Apparently delrins were built with a different rivet pattern and some later jigged bone scales were drilled and used on Delrin liners, hence the rivet pattern. In the end there are two versions, jigged bone and Delrin. After that lets just call everything else parts knives. No shame in that, take a 57 chevy, put in a new motor, new upholstery, and big rear wheels its still a 57 chevy. 300