PC, you ask for much. As for value that changes and some fish the bay and others don't at times. Hence, you could notice a high bid one week and a low bid another for the same knife. So, what's the normal selling price? I keep records in my notebook of Buck models I see for sale at shows. These are not Buck's new stuff, only those that would fit in my collection. Plus, notes are made on manufacturing changes, dates and stamps, ect.. These I look up a lot and it helps to have the information near by. I've ask our seasoned collectors and they write everything down. They keep it in notebooks with tabs and can flip to it when needed. During telephone conversations I can hear them turning the pages. So, it's organized at least good enough for them to find when they need it. For me historical information takes precedence over value. So, I put more effort there. The models alone make it a long rabbit hole to go down. Good luck in this endeavor. DM