"Ernst, Tobias
Stempelschneider in Königsberg von 1754 bis 1768." - https://ikmk.smb.museum/ndp/person/3474, 25.10.2020
"Ernst Tobias (Germ.). Die-sinker and Coin-engraver at the Berlin Mint, 1755. There is a pattern Species-Thaler of Frederick the Great by him." - Leonhard Forrer, "Biographical Dictionary of Medallists", Bd. 2 (London 1904), S. 26
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