Russia
U.S.S.R. silver Proof 10, 15, and 20 Kopecks 1924,
1) 10 Kopecks KM-Y86, PR66 NGC
2) 15 Kopecks KM-Y87, PR66 Cameo NGC
3) 20 Kopecks KM-Y88, PR66 Cameo NGC
The first-year issue of the change of name from. "Russia Soviet Federated Socialist Republic," to "Union of Soviet Socialist Republics." All are superbly detailed, with mirrored fields and no imperfections worthy of mention. The 10 Kopeck shows gold and reddish-blue patina, the 15 Kopecks is bright white, while the 20 Kopecks has mottled russet toning. Only one single Proof coin, of these three issues, has been certified higher than 66 by NGC.
Estimate: 10000-12000 USD