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Scott Fandangoi dont think it was written on during this period, because i collected in the 70's and the only card we wrote on was the checklist....we knew not to mark up the cards....
also, if someone was reading a detailed book/price guide about cards, they knew some may be valuable, so why would they mark them up and deface them?
Jefferson glued most of his cards into the binders at the MET, so he may have been inclined to also write on the back....
does anyone have a card with the provenance to link it to Jefferson himself?