Thanks Darrell, that's a better picture.
I have kept reference pictures of the pad stamps where the poster included them, but haven't linked to them in the spreadsheet yet, until I figure out how to host and share it. Ideally it would be accessible for members to add their own data, but there would have to be some editing limitations to maintain the data......
There is a filter on each column, you can see the drop-downs in the header row on that screenshot.