I doubt that this is due to broken perf pins. These stamps were comb perforated, so you'd have to have two broken pins in the same positions. Not likely, I'd think.
The missing perf holes are probably due to misalignment of the perforator. It should have been applied one perf hole lower. This block shows a less dramatic example of a horizontal mislaignment:
the upper row of stamps is slightly wider on the right and the lower on the left, because the comb didn't strike in precise alignment.
Posted 03/13/2013 6:33 pm
