"Schäfer, Friedrich Siegmund (Germ.). Medallist, Coin-engraver at Weilburg, 1749-1754; then Mint-master and Engraver at Eisenach, in the service of the Ducal court of Saxony, 1755-1776. He ...
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was a son of Wiegand Schäffer and was born at Düsseldorf in 1725. According to some sources he first collaborated for some years with his two brothers Anton and Joseph at the Mannheim Mint." - Forrer, L. "Biographical Dictionary of Medallists", Bd. 5 (London 1912), S. 348
