monety próbne, 50 groszy 1957, Warszawa; nominał 50, wklęsły napis PRÓBA na rewersie; Parchimowicz P210b; mosiądz 4.87 g; nakład 100 sztuk, pięknie zachowane i rzadkie, moneta projektu Andreja Petera, Josefa Koreňa i Antona Háma
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