Antique Carte de Visite (CDV) Photograph. Identified as Mrs. O.H. Johnson Photo by Charles W. Hearn Studio of Portland, Maine. Measures approximately 2.5 x 4.25 including mount. Condition: This is an original photograph, not a copy or reproduction. It is in very good condition. Comments: We discovered a couple of references to a Rev. O.H. Johnson of Maine in the 1870s.