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 these issues can be found with a perforated margin, giving the appearance of a blank field attached at the left. These copies, MiNr. 20 L, command a significant premium.

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.

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 these issues can be found with a perforated margin, giving the appearance of a blank field attached at the left. These copies, MiNr. 20 L, command a significant premium.

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.