Photographer: E. J. Potter
Ezra J Potter
(19 Sep 1844 - 2 Feb 1925)
All available documents indicate E. J. Potter was a photographer at his own studio in Mansfield, OH, from about 1865 when he was mustered out of the Union Army, until he retired about 1912.
He worked a short time in 1915, at age 71, for another photographer named Schwan.
The cabinet card above could have been done any time between about 1865 and 1912. The card is very lightweight and cream color both sides which would indicate pre-1880.
CDV example from Rescued Photo