If you're a stamp collector, then you might be excited to request this free Mystic's U.S. stamp catalog. (And honestly, if you're not a stamp collector, then please don't needlessly exhaust their supply by signing up.)
This 164 page catalogue has a complete listing & photos of over 4,800 US stamps, along with tips on collecting and caring for your items. There's also some historical facts in there. As luck would have it, I recently came across this TikTok explaining the origins of stamp collecting and found it fascinating!
@leven_parker The finest collection ever assembled and how it played a part in WWI. Put together by Philippe Von Ferrary #ww1 #stamptok #philately #philatelic #stampcollection #collection #france #fyp #viral ♬ original sound – Leven