Russia
Nicholas I Proof Polushka (1/4 Kopeck) 1850. EM, Ekaterinburg mint, Bitkin-621, UZD-3846, Brekke-22 (variety with dot after 0 of date), PR63 Brown NGC. Obv. Crowned monogram. Rev. Crowned date and value. Reddish-brown patina with mirrored fields. Very scarce. Ex: Falz-Fein Collection with original tag showing this piece as Lot # 673.
Estimate: 2000-2200 USD