Russia
Nicholas II silver Proof 10 Kopecks 1906 СПБ-ЭБ, St. Petersburg mint, Bitkin-158, KM-Y20a.2, PR66 Ultra Cameo NGC. Brilliant white, with fully struck, frosted, devices and deeply mirrored fields. Minor spots are noted for accuracy. The only example of this rare Proof certified by NGC. Ex: Sincona Collection, Part 1, October 9-12, 2012, Lot 1640.
Estimate: 2300-2700 USD