Find yourself a common Scott #610 (the flat plate perf 11). Then place it along side your 613 candidate. If you think your stamp is taller than the 610, then by all means send it in for certification. Then prepare, in all likelihood, to be disappointed. You are facing very very long odds.
Indeed, best is comparing to another one, and make a scan of both stamps, then you can easily compare them in your computer, which is always better then measurements.
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