Set Date(s)
1905 / 1920
Beginning in 1905, Germany began phasing in the use of watermarked paper on its new issues. Many color and perforation variations exist, primarily due to differences in peacetime and wartime printings.
These issues can be distinguished from previous Yacht Issues by the units of currency and the watermarks:
1901: Pesa/Rupien values, no watermark
1905: Heller values, no watermark
1905/1920: Heller/Rupien values, lozenge watermark
Numerous plate flaws exist.

Posn. 2, 3, 92, 97, & Unknown Others

Posn. 1
In 1902, the Reichsdruckerei (Reich Printing Office) began printing in the margins of stamp sheets the internal order number under which the stamps were printed. This order number, or Hausauftragsnummer (HAN), varied in location, typically being found in the right or bottom margin.
For imperforate copies of several of thse issues, see here.
Beginning in 1905, Germany began phasing in the use of watermarked paper on its new issues. Many color and perforation variations exist, primarily due to differences in peacetime and wartime printings.
These issues can be distinguished from previous Yacht Issues by the units of currency and the watermarks:
1901: Pesa/Rupien values, no watermark
1905: Heller values, no watermark
1905/1920: Heller/Rupien values, lozenge watermark
Numerous plate flaws exist.

Posn. 2, 3, 92, 97, & Unknown Others

Posn. 1
In 1902, the Reichsdruckerei (Reich Printing Office) began printing in the margins of stamp sheets the internal order number under which the stamps were printed. This order number, or Hausauftragsnummer (HAN), varied in location, typically being found in the right or bottom margin.
For imperforate copies of several of thse issues, see here.
