Watch List notes:

(g) (Tsarist) Russia, Nicholas I Pávlovich (1825-1855), Imitation of a Dutch Ducat, 1828, St. Petersburg, edge grained, 3.51g, 1h (Bitkin 21), removed from a clasp mount, otherwise lustrous, almost extremely fine, rare.
provenance
Gorny & Mosch 193, 14 October 2010, lot 5284
Estimate: £400 - £600