Beginning in 1905, Germany began phasing in the use of watermarked paper on its new issues.
This practice led to the introduction of new Yacht issues which were similar to the 1905 issues, but featured a lozenge-shaped watermark.
The “peace printings” of these issues can be found used, but the “war printings” were never postally used. The peace and war printings differ in that the peace printings are of clearer, better print quality.
MiNr. 35 and MiNr. 37 can be found with plate flaws.