Marken- und Ganzsachenhaus, Berlin: 1st, 3rd, 5th and 10th auction by Rudolf Siegel in mixed condition. In addition auctions 37th and 40th of Heinrich Köhler, 14th auction by M. Kurt Maier, 1922 Paul R. Schwerdtner auction and several other older catalogues from the 1920s/1930s (Mohrman, Kessler, Prehnalek, Müller, Brunner, Brun etc.) both separate and in 3 volumes
