Netherlands
Wilhelmina I Matte Proof 10 Gulden 1912 PR64 NGC, KM149. Mintage: 20. A great rarity in this proof format, with thick granular texture over the surfaces and olive-gold color as is seemingly commonplace on matte issues in gold. Two tiny flyspeck marks behind the obverse portrait are noted, but otherwise the surfaces are entirely absent of flaws. A prime example for the Netherlands' specialist given the almost non-existent record of this coin appearing at auction.
Estimate: 3000-4000 USD