As a history lover with appreciation for tactile aspects of history (love 100+ year old books), this scratches this itch better than anything else, while leaving me wanting more. I research and write up every banknote I acquire, and the sense of history I get from browsing my album is like nothing else.
For anyone interested, here are the photos of my collection circa end of last year: https://imgur.com/a/zmCXd8l