After a ten year search I have found a Civil War era photo of my great-great grandfather, Adjutant William B. Phillips of the 2nd Pennsylvania Provisional Heavy Artillery!
Nothing on the back. Great signature though! It is a “carte de visite” — very common during the Civil War. He is wearing a well-tailored 9-button enlisted man’s frock coat and kersey trousers. This was taken sometime before he was promoted to Adjutant-First Lieutenant — probably while garrisoned at Fort Lincoln in Washington D. C.