1882 May 12:
Chelsea post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1895 January:
The circular postmark is 26–27 mm in diameter.
(click on image to enlarge)
1901 April 30:
Chelsea post office closed. Note: a postmark of 1907 January 19 has been reported. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
Togus
1879 October 13:
The former National Military Home post office became renamed as Togus post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1894 June 1 through 1894 September 7:
The circular postmark is 22–23 mm in diameter.
(click on an image to enlarge)
1908 February 18:
Togus post office became named as National Soldiers Home post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
Veterans Administration Home Br. Augusta
1931 December 1:
The former National Soldier’s Home Br. Augusta post office was renamed as Veterans Administration Home Br. Augusta post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1934 January 25 through 1934 February 5:
The circular postmark is 27 mm in diameter; the 6-bar pointed oval is 15 mm x 35 mm; and the “return to writer” box is 81 mm x 23 mm.
(click on image to enlarge)
1934 September 1:
Veterans Administration Home Br. Augusta was renamed as Togus Br. Augusta post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)