Russia
Catherine II Rouble 1770 CПБ-CA, St. Petersburg mint, Bitkin-208 (R2), Diakov-244 (R3), Petrov (20 Rub), AU Details (Surface Hairlines) NGC. Obv. Crowned, and draped, bust right. Rev. Crowned double-headed Imperial eagle with date and value. Mottled gray and russet patina over lustrous surfaces. The strike is nice for the issue, and the surfaces exhibit a few light hairlines and marks, as one would expect of a nearly 250 year old coin. An exceedingly rare issue, with only this single piece certified by both NGC and PCGS combined. The finest example we can reference in any previous auction.
Estimate: 20000-25000 USD