i don't the Scott numbers, this is AFA 10By, print 7, Facit no is 17a.
perf is 12 3/4 * 12 3/4, and they will always, like most stamps from this era, vary a little.
the perforation is done with the comb perforator machine no 4 or 5, in this case, no 4.
and there hasn't been any tampering done to the perforation at all.
a sound stamp.
Quote:
Both printings of the 5c were intentionally printed with an inverted frame, with just one position of just one of the printings having an upright frame, which is why that one is so rare. So, it just depends on what was done with each DWI and Danish stamp printing.
during the printing of Danish stamps (and Dwi) the lower rows of cliche's were worn faster, so between printings they would sometimes turn the entire plate around to make the cliche's last longer.
there's however nothing intentionally about 1 upright frame, this is completely random.. and most likely just a mistake from a tired apprentice..
once again I'd refer to this thread on bicolored.
https://goscf.com/t/52341&whichpage=1