Canada
Elizabeth II Mint Error - Overstruck gold 25 Cents 1969 MS65 NGC, Royal Canadian mint, cf. KM62b. An extremely rare mint error or mint sport struck over a German States, Prussia gold 20 Marks dated 1906-A. Much of the detail of the original piece remains, and the coin itself has survived in fully gem condition, its flashy pale-gold surfaces shining with gentle wateriness. Comparable to an example of the same date, this struck over a Great Britain gold Sovereign dated 1967, that we offered in 2014 and which sold for $18,000 hammer. Possibly unique with the present undertype, and a trophy piece for the collector of Canadian mint errors.
https://coins.ha.com/itm/canada/canada-elizabeth-ii-mint-error-overstruck-gold-25-cents-1969-ms65-ngc-/a/3089-32367.s?type=CoinArchives3089
HID02906262019
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Estimate: 4000-6000 USD