Taken into service on 14 May 1607 by his father-in-law Johann von Worringen, the Goldsmith Konrad Duisberg (Duisburg) became
Mint Warden in Cologne (City), Germany, in 1608 and General Warden in 1631. Born in 1570, he died 7 May 1643 [Scheffler has
1648?] Lit.: Alfred Noss, Die Münzen der Städte Köln und Neuss: 1474-1794 (1926), pp. 47-49, 140, 185; Wolfgang Scheffler,
Goldschmiede Rheinland-Westfalens - Aachen - Köln (1973) n. 1154, p. 481.
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