1807 July 1:
Palermo post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1844 December 19:
Manuscript postmark. (notation; letter)
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1849 September 4:
Manuscript postmark. (letter)
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1910 July 8:
The circular postmark is 31–32 mm in diameter.
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date?:
Palermo post office.
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1934 December 5:
The circular postmark is 32–33 mm in diameter.
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1941 December 22:
The circular postmark is 33–34 mm in diameter.
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1950 February 20 through 1954 December 22:
The circular postmark is 32–33 mm in diameter. The outside vertical height of the four horizontal bars to the right of the circle is approximately 19 mm.
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2020:
Palermo post office, 111 Branch Road; Palermo, Maine. 04354. Lat./Long.: N 44°24′18″ x W 69°28′22″
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