Greece
John Kapodistrias Phoenix 1828-(c) AU Details (Cleaned) NGC, Aegina mint, KM4. Mintage: 12,000. An experimental, single-year denomination that comes highly sought in any grade, the present example of which, while cleaned, admits next to no evidence of striking weakness or use in jewelry.
From the Engelen Collection of World Coinage
HID02901242017
Estimate: 500-700 USD