"Herbach, Friedrich Caspar (Germ.). Goldsmith, Architect, and Medallist. He came from Saxony, and is also known as "Kunst-Caspar". He worked at the Copenhagen Mint from 1647 ...
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until his death, in 1664." - Forrer, L. "Biographical Dictionary of Medallists", Bd. 2 (London 1904), S. 481