Russia
Nicholas I platinum Proof 3 Roubles 1831 CПБ PR65 PCGS, St. Petersburg mint, Bitkin-77 (R), KM-C177, Fr-160. Obv. Crowned double-headed Imperial eagle. Rev. Date and value in circle. A truly superb example, with heavily frosted devices contrasting against the mirrored fields to give a spectacular cameo appearance. The strike is near-flawless and the surfaces pristine. Housed in an older PCGS holder, before they noted the degree of Cameo on the holder. Undoubtedly, today, they would call this piece Deep Cameo.
Estimate: 15000-20000 USD