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Wikidata: Q671899 Read more
1 Groshen = 12 Parvus / 1 Groshen = 7 Pfennig = 14 Heller/ 1 Dukat (Floren) = 30 Groshen (varied in time)
420 Heller = 60 Kreuzer = 1 Thaler (Ducat value varied)
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1 Heller - Nicholas VI, Waclaw III, John V (Duchy of Ratibor) 
