Unknown portrait painter of the Biedermeier period, around 1800-1830, older man in black skirt, hair fashion of the period 1800-30, unsigned, oil/lwd, 65x53 cm, Biedermeyer tulle frame 83x70 cm, verso expertise of Dr. Paul Eich (Städel, Frankfurt) from July 1978 with attribution to the Berlin Johann Conrad Krüger (1733-1791), probably Johann Heinrich Israel (1772-1849), Kurfürstlich-Kgl. Prussian Commercial Council, restored by Helmut Tomashek, Frankfurt at the same time