Netherlands
Willem III gold 10 Gulden 1851 UNC Details (Private Countermark) NGC, KM95, Fr-340. A sharp example, presenting semi-Proof surfaces, not spoiled by the tiny countermark to the right of the shield.
https://coins.ha.com/itm/netherlands/netherlands-willem-iii-gold-10-gulden-1851-unc-details-private-countermark-ngc-/a/3098-34238.s?type=DA-DMC-CoinArchives-WorldCoins-3098-01182022
HID02906262019
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Estimate: 1280-1920 USD