Unknown portraitist
Signed illegibly
Monogrammed
Unsigned
Drehmann, R.
Blumenau, Richard
Asperger, H.
Schmelz, H
Knight, Otto
Rein, B
Unknown artist of the 19th century
Verschuur, C. (for Cornelis Wouter Bouter 1888 - 1966)
Halberg-Krauss, Fritz (1874 Stadtprozelten am Main - 1951 Prien/Chiemsee)
Liberata, M.
Leistikow, Walter (1865 Bromberg - 1908 Berlin) Environment
Dorn, Friedrich (1861 Nosdorf - 1901 Hamburg)
Tiedt, Jürgen (1948 - active in Mecklenburg)
OK Interrupt