This is an image of Lt. Allan H. Dougall (1836-1912) of the 88th Regiment Indiana Infantry.  He was awarded the Medal of Honor in 1897 for his service in the Battle of Bentonville in North Carolina in 1865.  The image is from the Indiana State Library's collection of Civil War photographs.  The date of the image is inferred from the period during which the photographer Frank R. Barrows maintained his studio at 18 West Berry St. in Fort Wayne, Ind., before moving to a different location.
Frank R. Barrows, photographer, 18 West Berry St., Fort Wayne, Indiana
between 1880 and 1888 <div style="display: none;">date QS:P,+1880-00-00T00:00:00Z/8,P1319,+1880-00-00T00:00:00Z/9,P1326,+1888-00-00T00:00:00Z/9</div>
<a rel="nofollow" class="external free" href="http://www.in.gov/library/exhibits/civilwar/DougallAllanH.jpg">http://www.in.gov/library/exhibits/civilwar/DougallAllanH.jpg</a>