Beginning in 1905, Germany began phasing in the use of watermarked paper on its new issues.

This practice eventually led to the introduction of new Yacht issues which were similar to the 1900 issues, but featured a lozenge-shaped watermark.

The 3 Pf and 5 M values were never postally used due to the fall of the German Togo. The stamps were only sold at philatelic sales windows in Berlin.

MiNr. 23 I A is a “peace printing” issued in Jan 1915, and therefore shows different qualities from the remaining “war printing” (1919) issues of this set. It is lighter in color overall, with better quality paper and printing.

Two of the MiNr. 23 varieties can be found with a plate flaw.

MiNr. 20 was printed in 10×10 sheets, which were then run through a perforation machine. The machine used to perforate an unknown number of these sheets was designed to perforate two 10×10 sheets printed side-by-side with a margin in-between, rather than a single 10×10 sheet as the stamps were printed. This resulted in an extra perforation along the left margin of the sheet. For this reason, left margin copies of some printings of this issue can be found with a perforated margin, giving the appearance of a blank field attached at the left. These copies command a significant premium.