Monaco
Charles III gold 20 Francs 1879-A MS64 NGC, Paris mint, KM98. Two year type. AGW 0.1867 oz.
https://coins.ha.com/itm/monaco/monaco-charles-iii-gold-20-francs-1879-a-ms64-ngc-/a/3083-32668.s?type=CoinArchives3083
HID02906262019
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Estimate: 300-500 USD