NIEBOROWITZ 2.4.1920 single circle (230.1) on package card with mixed franking and mass franking 15 Pfg dark gray violet block of six postage stamps issue drawing numbers 1920 on face, 5 Pfg green 10 Pfg postage stamps issue drawing numbers 1920, 10 / 20 Pfg blue block of nine and single stamp provissional issue 1920 at back to Wroclaw, transport traces