Not all of the stamps of this series were issued in the same year, it started in 1913 and ended in 1932. Not uncommon in that era. That is why the numbers in the older Scott catalogues jump around. Shown is a section of the Dutch NVPH catalogue it shows the complete series. the years of issue are mentioned, if no year is mentioned, it means issued in 1913. Colorguide: Karmijn means red, Blauw means blue, rood means red, Groen means green, oranje means orange, roodbruin means reddish brown, lila menas lilac , zwartgrijs means greyish black.
As Rod already mentioned the ink is water fugitive, be carefull or do not soak at all.
