Russia 1992 Silver Medal Ballet German Numismatic Convention Stuttgart. Authenticity is certified by Numismatic Guaranty Corporation NGC. Grade by NGC: PF 68 ULTRA CAMEO. Mintage only 1,000 medals. Add a map to your own listings.The item "Russia 1992 Silver Medal Ballerina Numismatic Convention Stuttgart NGC PF68" is in sale since Tuesday, January 6, 2015. This item is in the category "Coins & Paper Money\Coins\ World\Europe\Russia\Federation (1992-Now)". The seller is "worldqualitycoins" and is located in Nokomis, Florida. This item can be shipped worldwide.