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.
These issues were never postally used due to the fall of the German Karolinen. The stamps were only sold at philatelic sales windows in Berlin.
“Peace printings” exist for MiNr. 22 (MiNr. 22 I A). The “peace printings” are slightly different in color from the “war printings,” with better quality paper and printing.