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I don't understand .... GPO (General Post Office) Does that not apply only to major offices in each state capital?
Not necessarily. The US Passport Office still refers to Staten Island's Main Post Office as a "GPO" based on this link, even though the designation seems to be dropped from the USPS web site:
http://www.passportoffices.us/NewYo...tOffice.htmlHistorically, based on the stamp you originally posted, the Staten Island GPO was located at the St. George Office and later relocated to its present Manor Road location, based on this quote:
