Russia
Nicholas I silver 5 Kopecks 1851 CПБ-ПA MS66 NGC, St. Petersburg mint, Bitkin-409, KM-C163. Obv. Crowned double-headed Imperial eagle. Rev. Crowned date and value in wreath. Full mint frost, with a dusting of golden toning over proistine, reflective surfaces. None have been certified finer by NGC, or PCGS.
Estimate: 800-1000 USD