Netherlands
Wilhelmina I gold Proof Ducat 1914 PR65 NGC, Utrecht mint, KM83.1a, Fr-352, Sch-768. Well struck, with frosted devices and a nice cameo appearance. The only other example we can reference is the PR64 coin from the Lissner Collection, sold by CNG/St. James on Aug 1, 2014 for $4250. Extremely rare in Proof.
Estimate: 3500-4000 USD