This 5c block has only only a single perforation at the side selvedge instead of being perforated all the way to the edge. Normally De La Rue sheets were not perforated at the top and this block of 6 has 2 perforations right at the edge of the top selvedge.
This 5c block is different in having only a single perforation at the top edge of the selvedge above and also perforated through at the side.
This 6c block shows rows of 6 perforations at the top of the selvedge which are not in line with the normal vertical lines of perforations on this block.
This $1 block of 4 shows staining of the surrounding white paper with the yellow green ink used for printing the border. It has multiple rows of perforations at the top selvedge with half of them in line with the normal vertical lines of perforation. There is only one side perforation and this is normal for all the dollar values of this set. It is difficult to know why these extra perforations were done. Were they trials or done by mistake because they do not serve a defined purpose.
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