1834 May 9:
Hermon post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
date?:
Hermon post office (at right of lower left image).
(click on an image to enlarge)
1919 January 31:
Hermon post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
Hermon Pond (2)
1931 January 23:
Hermon Pond (2) post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1939 December 11:
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 18 mm.
(click on image to enlarge)
1940 September 9:
The circular postmark is 31–33 mm in diameter. The outside vertical height of the four bars at the right of the circle is 18–19 mm.
(click on image to enlarge)
1942 August 31:
Hermon Pond (2) post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)