German States
Frankfurt. Free City Proof 6 Kreuzer 1866 PR67 Cameo NGC, KM374. A solid Proof example of this issue with obvious cameo contrast.
https://coins.ha.com/itm/german-states/frankfurt-free-city-proof-6-kreuzer-1866-pr67-cameo-ngc-/p/61153-11019.s?type=CoinArchives61153
HID02906262019
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Estimate: 200-250 USD