William IV Proof Penny 1831 PR66 Brown NGC, KM707a, S-3845. Coin Alignment. Coated in a thick patina of periwinkle and cobalt, a stunning look on the sleek expanses. A single example at NGC ranks higher, conditionally desirable thus. From the Abbeygate Collection HID09801242017 © 2023 Heritage Auctions | All Rights Reserved

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