Russia
Alexander I Poltina (1/2 Rouble) 1817 СПБ-ПC MS67 NGC, St. Petersburg mint, KM-C129, Bitkin-158. Exquisite luster, with a light cobalt tone near the peripheries and argent surfaces in and around the devices. There is a minor die crack which runs around half of the obverse legend, but doesn't in any way detract from the coin's brilliance. The single finest example certified by NGC, with the next finest an MS64.
Estimate: 4000-5000 USD