Carl Heumann lived from 1908 in Chemnitz, where he was a banker in Bankhaus Bayer und Heinze (from 1908 Prokurist, from 1920 co-owner of the private bank) and vice-consul of Portugal.

The coin collector Leo Heymann, born in the town of Schwersenz, which with its large Jewish community was until 1918 part of the German district of Posen-Ost and in 1919 became part of Poland under the provisions o