Poland
Revolutionary gold Ducat 1831 AU55 NGC, KM-C125, Fr-114. A popular one-year type struck during the Revolutionary Uprising of 1830. A solid strike with lightly reflective surfaces and only a touch of wear.
https://coins.ha.com/itm/poland/poland-revolutionary-gold-ducat-1831-au55-ngc-/a/3088-35073.s?type=CoinArchives3088
HID02906262019
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Estimate: 800-1200 USD