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Stamp Smarter - Printable Perforation Gauges
Perforations: the Hole in the Corner
Two computer programs that can measure stamp perforations
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How to measure perforations — Mystic Stamp Discovery Center
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Two computer programs that can measure stamp perforations
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Stamp perforations and their types - The Stamp Echo
Perforation Gauge | The Stamp Forum (TSF)
Perforation Gauge
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Stamp perforations and their types - The Stamp Echo
