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TIL what a "postal cover" was, and how "cancelled envelopes" work.

Which made me realize how little I've ever used the postal services for actual letters in my life. My generation (late 80s / early 90s) must be one of the last to interact with the postal system when personally sending letters to people, rather than just parcels.

https://en.wikipedia.org/wiki/Event_cover

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




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