They look different because they are different. The one with the wavy line cancel is 610 perf-11, on the right is 612 perf-10. The perforations are different, the design sizes are different, and the lightness of impression is different. A 613 'looks' like a 612 on the size and impression criteria, but must be perf-11.
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Posted 08/24/2014 7:34 pm
