Watch List notes:

The Oksana Bennett Collection of Russian Coins | Nicholas I Pavlovich (1825-1855), 20-Kopeks, 1826-CNB, St Petersburg, Nicholai Grachev, crowned double-headed eagle, wings up, rev. crowned value and date in wreath, incuse edge graining, 1h (Sev. 2879; Uzd. 1504; Diakov 4; Bitkin 98), handsome iridescent tone, extremely fine, very rare, in NGC holder, graded AU58 (Cert. 3593520-008)

provenance
New York Sale XXXI, 10 January 2013, lot 1197