Of greater interest to specific collectors, is yours still in percussion format? After the Civil War, many carbines were converted to take rimfire ammunition. The nipple was removed, a steel block and firing pin was installed. Does yours still have a nipple with a hole through it? If so, it is original percussion, and would be preferred by Civil War collectors. Some people collect only Indian War weapons, so the converted model would be of greater interest to them.
Just so you know, your carbine has nothing to do with the special rifles issued to Berdan. I own a Berdan, as well as several Sharps carbines, and they still shoot quite well.