1914 - 1918, rich in substance collection in cancelled condition on old Schaubek preprinted pages, amongst other things as well Bialystok Michel no. 1 I and 1 II (2), provisional issue for Libau always expertized Schlegel A. BPP Michel no. 1 Ba, 2 Ba (2) and 6 Bb (latter with tear on piece, abridged certificate with photo), and so on. And so on.