Canada
Elizabeth II Mint Error - Double-Struck gold Proof "National Parks" 100 Dollars 1985 PR68 Ultra Cameo NGC, Royal Canadian mint, KM144. Exceedingly neat and attractive considering its status as an unintentional mint error, this gold 100 dollar coin represents a clear case of a capped die, with the edges uniformly folded upward to the reverse, Elizabeth's portrait on the obverse having been doubled from the subsequent striking of a new planchet. We have seen two prior instances of double-struck coins of this type, though never one of this nature, offering an intriguing intersection of visual and academic appeal.
https://coins.ha.com/itm/canada/canada-elizabeth-ii-mint-error-double-struck-gold-proof-national-parks-100-dollars-1985-pr68-ultra-cameo-ngc-/a/3081-30285.s?type=CoinArchives3081
HID02906262019
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Estimate: 8000-10000 USD