Ключевые слова: ancient, antique, bank, banking, blue, cash, closeup, coin, coinage, coins, collection, communist, copeck, currency, economic, finance, financial, gray, history, imperial, instrument, kopeck, kopek, magnification, magnifier, magnifying glass, metal, money, numismatics, obverse, old, one, pay, payment, rarity, research, retro, reverse, round, russia, russian, sign, silver, single, soviet, symbol, twenty kopecks, union, ussr, white,