Russia
Nicholas I Proof 25 Kopecks 1850 CПБ-ПA, St. Petersburg mint, Bitkin-301, Severin-3566, KM-C166.1, PR63 NGC. Obv. Crowned double-headed Imperial eagle in a circle. Rev. Crowned date and value in a wreath. An excellent strike, with fully mirrored fields beneath gold and cobalt-blue toning. Very rare in Proof condition. Ex: Falz-Fein Collection, with original tag showing this piece as Lot # 668.
Estimate: 2000-2500 USD