Ernest Jan Biron (Duke of Courland and Semigallia; 1763–1769), Schröder, Justyn Karol (master of the Mitawa mint 1763–1764). Grosz coin, silver (MON. ARGENT.), Duchy of Courland and Semigallia, Mitawa, 1763–1764; weight 1.00 g. Obverse: under the ducal mitre a tied monogram composed of the letters E J; date numerals 17 - 6 at sides. Reverse: under the crowned mitre two coats of arms — White Eagle and Pogoń (Chaser); rim inscription MON.ARGENT.DVC:CVRLAND, 1763–1764. Coats of arms, shields, monograms; Biron family., A round, worn coin with a textured surface showing a raised central design spli

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