BuckaCover.com - 80,000 covers priced 60c to $1.50 - Easy browsing 300 categories 25 Jan 2021 08:06:41pm
re: GPO Postmark
"This seems to be a bit of a conundrum.
A US minisheet with a UK type postmark."
According to the USPS publication linked above, the US Post Office also used the term "General Post Office", but the term is now obsolete in their lexicon.
Roy
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