6 groschen. Graefenstein, G. Z. (fl. 1761), creator, Schröder, Justus Karol (fl. 1768-1772), creator, Ernest Jan Biron (książę Kurlandii i Semigalii ; 1763-1769), ruler

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Keywords: (duke, 1690–1772, biron, courland, ernest, jan, semigalia