Netherlands
Willem III gold Proof 10 Gulden 1877 PR64 Ultra Cameo NGC, Utrecht mint, KM106 (unlisted in Proof), Fr-342, Schulman-551. A stunning example with pristine and fully mirrored surfaces. Very rare as a Proof, and further aesthetically desirable due to its complete cameo contrast.
Ex. Heritage Auction 458 (January 2008, Lot 51897)
From the Caranett Collection
https://coins.ha.com/itm/netherlands/netherlands-willem-iii-gold-proof-10-gulden-1877-pr64-ultra-cameo-ngc-/a/3083-30497.s?type=CoinArchives3083
HID02906262019
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Estimate: 3000-4000 USD