I dug out a couple more old catalogues I have and the PEI 11 x 11-3/4 is listed as 5ii in the 2000 Unitrade and 5f in the 1961 Lyman's. Remember Lyman's?
I was going thru my PEI 5 stamps and had considered the vertical perfs on them compound 11 1/2 - 12. Perf 12 horizontal. Reading this thread I now wonder if the perf gauge I am using should be changed to one of the more specialized ones that would measure increments less than 1/2. Measuring the vertical perfs in this fashion yields inaccurate results?
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