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Of German or Swiss origin, Gass began work at the Saint Petersburg mint in 1768 as assistant engraver. He was chief engraver from 1772 until 1797, when he resigned due to bad health. See Forrer 2, p. 205; 7, p. 341; Thieme-Becker 13, p. 232. --- from The Molinari Collection, Andrea S. Norris and Ingrid Weber, Published by Bowdoin College, 1976