The 20th Connecticut
One of the albums my sister in law gave me (bought in an antique store in Waltham, perhaps 25 years ago) includes a set of portraits of officers of the 20th Connecticut Volunteers, many of them autographed. It's not clear if these were personally inscribed.
Col. Samuel Ross
Lt. Colonel William B. Wooster
Lt. Col Philo B. Buckingham
Captain William Watson Smith
Captain Ezra Dickerman
Captain Illegible
Chaplain Rev. A.L. Frisbie
Adjutant N.B. Abbott