Mintmaster in Bonn, a city in Germany, from 1739 to about 1776, in which year he is thought to have died, with monogram I
K. Kohlaas was the son-in-law of Hittorff's widow. Lit.: Alfred Noss, Die Münzen der Erzbischöfe von Köln 1547-1794 (1925)
pp. 350, 353, 415.