Denmark #35 With Erratic Perforations

Bottom row not straight

The perforation was done by H.H. Thiele and seems to have its random moments. Early Iceland is the same. I don't know if Sorsh, our Denmark expert, can throw any more light on this?

Sure can, this stamp was perforated with a KII machine, small corner figures 4th printing.

the perforation is a little worn i'm afraid and bears tell tale signs of both 5th and 6th vertical row.
the machine is a comb perforator, which would perforate a sheet on the top and both sides, then the paper would be moved forward with a gear, and the perforator would come down and do the bottom of the first row and top of the 2nd and so on.

this technique thus means that a stamp would have identical horizontal sides... but left and right side are different... making 10 identical stamps in each vertical row (sheets of 100)

Thank you Sorsh. This information is very helpful.