Canada
Elizabeth II Mint Error - Off-Metal Planchet Prooflike 50 Cents 1970 PL64 NGC, Royal Canadian mint, KM75.1. Struck in 72% silver and 28% copper, quite out of the norm for a type meant to be struck in nickel! The specimen exhibits prooflike mirrored fields, the reflectivity only softened by an airy silver patina that graces the fields. We have only encountered one such error before, a PCGS-certified example which sold for a total of $3,760 including Buyer's Premium (Auction 271722, Lot 38255).
https://coins.ha.com/itm/canada/canada-elizabeth-ii-mint-error-off-metal-planchet-prooflike-50-cents-1970-pl64-ngc-/a/3076-31188.s?type=CoinArchives3076
HID02906262019
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Estimate: 1000-2000 USD