This site indicates it is an albumen print in 2 3/8" by 4" format. Also that is would almost have to have been made post-war. Matthew Brady started using this in late 1865. As to the officer's identity, your guess is as good as mine.
The site indicates that the Imperial CDV was larger than what you state.
I have been trolling the uncharted recesses of my photo collection and dredged up this photo CDV of what appears to be a two star general. I have never been able to identify him. Does anyone have any ideas on his identity or even possible sources of information about same?
Thanks in advance,
I apologize for thinking a two-star General was a BG; rather than a MG.
I stand by my opinions, however, that Burnside and Chamberlain were much younger when they achieved that rank. The absence of any other accoutrement makes me wonder if perhaps it is the uniform of a military school, or some such.
Yes Chamberlain was a young man when first a two star general. http://www.civil-war.net/cw_images/files/images/298.jpg
But these photos are often made at the reunions of the union army.
Camberlain died in 1914 and this image looks quite elderly; this would not be possible as a real Brady image. Brady's Washington studio closed in 1881, New York in 1875, Putting this image before 1875, but his images were copied by Antony co. and reproduced for many years.
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).