Jim Forte's website has PO listings including the sequence: Counover, Winneshiek County, Iowa, 1865-1881, and Conover, Winneshiek County, Iowa, 1881-1914.
Spelling: "Connover": in Postal Bulletin #125, dated July 29, 1880, appointing a postmaster there. And the apparent spelling on your cover.
"Counover": in January 1882 Postal Guide, in 3 places for the general, state, and county lists, which is after the 1881 date provided by Forte.
I am unable to locate a "name change" listing in this era in the Postal Bulletins despite several search permutations on the town and county names.
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