Great Britain
Elizabeth II Mint Error - Wrong Planchet 50 New Pence 1978 MS64 PCGS, KM913. Struck on 10 Pence planchet.
https://coins.ha.com/itm/great-britain/great-britain-elizabeth-ii-mint-error-wrong-planchet-50-new-pence-1978-ms64-pcgs-/a/3082-34190.s?type=CoinArchives3082
HID02906262019
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Estimate: 300-400 USD