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United States/Covers & Postmarks : Question Regarding Tagging Omitted & Postmark

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pedroguy
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20 Mar 2017
05:29:46pm
First how do I determine if the tagging has been omitted, there's a big difference in value.Image Not Found
Second The Stamp was issued on Sep. 9,1969 but the cover also has a July 20,1969 postmark which is when the landing took place, WHY?

Any help would be appreciated....Stumped in New Jersey

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khj
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20 Mar 2017
07:30:06pm
re: Question Regarding Tagging Omitted & Postmark

To detect tagging, you will need a short-wavelength UV lamp (wavelengths near ~254nm), preferably a filtered one. The consumer-grade decorative black lights won't do the job. If your stamp is tagged, you will see the front side of the stamp dimly and unevenly photoluminesce a red-orange color.

The commemorative 20Jul1969 Moon Landing postmark is common on the FDCs for this stamp. It's a back-dated commemorative cancel, and has no postal validity.

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michael78651
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20 Mar 2017
10:54:44pm
re: Question Regarding Tagging Omitted & Postmark

The tagging color on stamps can be colors other than red-orange as is for this stamp. Most tagging appears green. (Just didn't want someone to think that tagging was just that one color.)

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