Die postfreimarken und die entwertungen der deutschen postanstalten in den schutzgebieten und im auslande
A German philatelic reference of 1908 by Albert Friedemann, published in Leipzig, cataloguing postage stamps and the cancellation marks of German post offices in colonial protectorates and abroad. The pictures are circular postmark impressions with town names, dates and inscriptions such as Kiautschou, Südwest-Afrika and Kaiserlich Deutsche Feldpost, and a designer might take from them the layout of ring-type cancellation stamps with curved lettering around a central date.
