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A comment on Apollo 15 postage stamp incident. Parent comment

Re:Apollo 15 postage stamp incident by homero on Tuesday April 30, 2019 @08:59PM (#19793579)
I still don't understand what a cover is. Is it the cancellation stamp?
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Re:Apollo 15 postage stamp incident by astura on Tuesday April 30, 2019 @11:51PM (#19794394)
A cover is essentially an envelope (it got it's name because it covers the contents), usually stamped and those stamps cancelled.

Here's some examples of fancy covers:

https://store.usps.com/store/results/collector-s-zone-first-...

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Re:Apollo 15 postage stamp incident by meemo on Tuesday April 30, 2019 @10:44PM (#19794083)
According to https://en.wikipedia.org/wiki/Event_cover they are "decorated, stamped and canceled commemorative envelopes"

Essentially they are envelopes with stamps and a marking over the stamps that prevents the envelope and stamps to be used.

https://en.wikipedia.org/wiki/Cancellation_(mail)

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