This carte de visite photograph is by celebrated photographer Emilie Bieber. She was a very successful and talented female photographer. Female photographers were uncommon in the cdv era. Bieber is definitely one of my favorite photographers. You may view additional photographs by Miss Bieber by typing her name in the cabinet card gallery’s search box. Bieber had two locations in Germany; Berlin and Hamburg. She ran her Hamburg studio from 1852 through 1872 when she was joined by her nephew, Leonard Berlin-Bieber. Emilie Bieber died in 1884. This cdv portrait features a well dressed gentleman with wonderful mutton chops. He is not wearing an accompanying mustache. Printing on the reverse of the carte de visite brags about the medals won by this studio. Awards were earned from exhibitions in Berlin (1865), Hamburg (1868), Paris (1870), Vienna (1873), as well as other photography competitions. This record of photographic honors informs us that this cdv was produced in 1873 or shortly afterward.
THE CABINET CARD GALLERY 
After seeing your note about this photographer I remembered the name from a stack of German & Swiss cdvs that I had passed on. So went back and there was one by her, not very special but dealer sold me the whole stack for $5. A bargain and I hate splitting up family photo groups. I greatly admire your research. Thank you.