Gentle recommendation, gauge the rate of perforations first to begin the narrowing process. The dimension of the printed image is far down the list of things to determine and seldom necessary to do.
Using your first (1 cent green) stamp as an example, there is a very high certainty you will find the top/bottom to gauge at 11 (or a little higher), and the sides at 10.5, which gauging alone will ID the stamp positively as Scott 632.
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Posted 03/20/2020 8:59 pm
