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United States/Stamps : Perforations

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LarryG
27 Nov 2015
12:17:49pm
My new Precision U.S. Specialty Multi-Gauge has a perforation gauge for Bureau Issues. There are multiple sizes for some of the perforations . An example is 10-81, 10-80 , 10-79. Perforations 11 and 12 also have multiple numbers
What does the second number indicate and can it be used to differentiate stamps?

Thank You,
Larry
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seanpashby
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27 Nov 2015
12:38:22pm
re: Perforations

Hi Larry, I recently wondered the same thing. Click the link below to see a lot of info. The short answer is that the second number is the distance between the holes, or pin spacing in thousands of an in.

here

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LarryG
27 Nov 2015
04:43:03pm
re: Perforations

Thank you. The sites referred to are a help.
Larry

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