1879 October 24:
The former Industry post office was renamed as Allen’s Mills post office opened. (source: Maine Philatelic Society. 2021. Updated Rarity Guide)
1894:
Allen’s Mills post office was renamed as Allens Mills post office. (source: Maine Philatelic Society. 2021. Updated Rarity Guide)
Allens Mills
1894:
The former Allen’s Mills post office was renamed as Allens Mills post office. (source: Maine Philatelic Society. 2021. Updated Rarity Guide)
1901 December 31:
Allens Mills post office closed. (source: Maine Philatelic Society. 2021. Updated Rarity Guide)
1904 February 19:
Allens Mills post office re-opened. (source: Maine Philatelic Society. 2021. Updated Rarity Guide)
1915 August 15:
Allens Mills post office closed. (source: Maine Philatelic Society. 2021. Updated Rarity Guide)
Industry
1816 October 28:
Industry post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide)
1879 October 24:
Industry post office was renamed as Allen’s Mills post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide)
West Mills
1828 March 22:
West Mills post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide)
1905 March 25:
The circular postmark is 29–30 mm in diameter. Note spelling of “Wests Mills”.
1916 November 2:
The circular postmark is 32–34 mm in diameter. The outside vertical height of the four horizontal bars to the right of the circle is approximately 20 mm.
1932 July 30:
West Mills post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide)