Estados Unidos copper Proof "Monarch Butterfly" 100 Pesos 1987-Mo PR66 Red and Brown Mexico City mint, KM-Unl. An elusive off-metal copper strike of this WWF issue, labeled as Proof but emitting a more satiny texture from the flan, all veiled in a lively scarlet, azure, and goldfish-orange patina. HID09801242017 © 2022 Heritage Auctions | All Rights Reserved

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