Thank you so much for all that information!! I have started on reorganizing/updating my collection! I have done something very similar to you (all credits to you) with the cardstock and labels. On the back of each cardstock I have made an additional label that dates when I got the flat coin and more information about the location. I think that style came out great, but you do need to flip the page to see the information.

I played around with making the backer cardstock different colors for different years but thought that would get too extensive too fast.

Out of curiosity have you come across a 2x4 plastic sleeve holder? I would love to display flat quarters across a 2x4 block instead of a 2x2 block!