Kurt Kiesling
Philatelist and postage stamp expert specializing in stamp perforation measurement, known for his research on the Kiusalas/Kusalas gauge published in The United States Specialist.
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Aug 26, 2026
CashHOST
How did you determine it and what was that failure rate on both ends?
Kurt KieslingGUEST
So, for example, a typical bell curve that I showed on the PERF-11s I think had 400 measurements.
Kurt KieslingGUEST
And all that does is plot out each one of those measurements on a horizontal axis.
Kurt KieslingGUEST
And the height of the curve shows the relative number of stamps at that particular measurement.
7 MINS LATER
MarkPANELIST
Well, if you compare the other four sides, or the other three sides, and three sides are right on the gauge and the fourth side is not, then that helps you confirm your suspicion.