Russia
Nicholas I 20 Kopecks 1828 СПБ-НГ MS67 Prooflike NGC, St. Petersburg mint, KM-C158, Bitkin-135. This beautiful prooflike specimen yields to the observer a most outstanding sheen, under which lies an array of rainbow brilliance and sublime radiance. An absolute gem in every sense of the word.
Estimate: 4000-6000 USD