Re:Apollo 15 postage stamp incident
by stordoff on Tuesday April 30, 2019 @07:23PM
(#19793017)
"postal covers" (the article title) would seem to handle that.
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in my 40+ years of living in english speaking countries and sending thousand of pieces of postal mail over that time, i've never heard the phrase 'postal cover'. 'postal' is the only clue that indicates it's ... to do with 'postal' stuff.