Russia
Catherine II 20 Kopecks 1771 CПБ, St. Petersburg mint, Bitkin-379, Diakov-264, MS63 PCGS. Boldly defined devices, with slate-gray toning over lustrous surfaces, and no significant flaws. Very rare in this condition and the only example certified in Mint State by either PCGS or NGC.
Estimate: 2000-2500 USD