monety próbne, 20 groszy 1949, Warszawa; nominał 20, wklęsły napis PRÓBA na rewersie; Parchimowicz P207c; aluminium 20 mm, 0.96 g; nakład 100 sztuk, pięknie zachowana i rzadka moneta projektu Andreja Petera, Josefa Koreňa i Antona Háma
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