Watch List notes:

Nicholas I (1825-1855), Pattern 10-Kopeks, 1830, St. Petersburg, crowned double-headed eagle, rev. value, signature below, edge plain, 45.47g, 12h (Uzd. 3276; Diakov 78; Bitkin 921), rich patina overlying brilliant surfaces, good extremely fine, extremely rare, one of only 25 struck

provenance
Spink, Coinex Sale, 6 October 2004, lot 1064 [part]