I believe this is Wexler Rpm-007. I have a system that seems to be working for me. This was probably in a box I search through a while ago. What I do is keep the keys dates as I search through rolls into a separate tubes. Once the tubes are full of one date. I look through them.
I hate to show my novice-colors here but I've just began sorting cents and I'm curious...With so many cents that have errors or variation where can I go to find a complete list?