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Il Forrer (1902-30, III, p. 223) riporta: His issues usually bear his initials I. K. Schlickeysen suggests that he may have engraved coins, signed I. K. for Eimbeck, 1629. In the Reimmann Sale there were a Thaler, 1645, Double Thaler, 1646, and Quarter Thaler, 1649, of Johann Martin, Count of Stolberg, all signed I. K.
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