There were a surprising number of different revolving rifles produced in the United States in the mid 1800s, including a number of turret rifles like this one. Specifically, we have here a 7-shot, approximately .55 caliber Daniels turret rifle (well, not technically a rifle, as it is smoothbore). It was patented by Charles and Henry Daniels in 1838, and manufactured by C.B. Allen - a man who also manufactured the Elgin cutlets pistols and Cochran turret rifles and pistols. Only about 50 of these Daniels guns were made - none of the turret rifle designs were ever commercially successful.