Netherlands
Willem I gold 10 Gulden 1840 MS63+ NGC, KM56. Notably frosty atop the devices with a clear mirrorlike reflectivity present in the fields.
https://coins.ha.com/itm/netherlands/netherlands-willem-i-gold-10-gulden-1840-ms63-ngc-/a/3076-34411.s?type=CoinArchives3076
HID02906262019
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Estimate: 500-700 USD