Thanks again for all the detective work. The photo is larger then a cdv so I guess that would make it a cabinet card. The back of the photo is written "Brady Photo Washington DC" and in what looks like different ink 1859. Additionally I also have the original envelope that the Cabinet Card came with. It is unstamped and not dated but it is written
"For Mrs.(I believe the word is Mrs.) Miller with Mrs. Mosher's compliments" base on what was written in previous posts I wonder if this was maybe acquired by Charles D Mosher's studios and sent out after he acquired it by his wife.
I also cannot find a photo of Dr. Thomas Miller anywhere on the internet but he was definitely prominent enough to have been photographed by Brady so perhaps this is a photo of him.
