Wall Street Auction #XXI, Sessions 2 and 3

Banco Central De Costa Rica, 1969-70 Issue Proof Face & Back Banknote. San Jose, Costa Rica. 10 Colones, P-230 Unlisted proof, Blue without underprint or overprints, POC's, Each proof is printed on thin white india type of paper with large margins and plate number on top, each note would grade Gem Unc. But there are minor folds in the excess margin far from the note. Rare proof format. ABNC.