1911 September 11:
The circular postmark is 28–29 mm in diameter.
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1925 June 26:
The circular postmark is approximately 32 mm in diameter. The outside vertical height of the four horizontal bars to the right of the circle is 18–19 mm.
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date?:
Hebron post office.
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1940 March 4 through 1950 May 6:
The circular postmark is 30–31 mm in diameter.
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today:
Hebron post office is still in operation.
Hebron Station
1891 January 2:
Hebron Station post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide)
1933 May 2 through 1935 June 12:
The circular postmark is 32–33 mm in diameter. The outside vertical height of the four bars to the right of the circle is 19–20 mm.
(click on an image to enlarge)
1936 December 31:
Hebron Station post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide)