On the bench for show and tell:

A customer’s Civil War Era, EG LAMSON & Co, Ball Repeating Carbine

Fascinating to see in person, the only other one I have seen is in the NRA Museum.

http://www.nramuseum.org/guns/the-galleries/a-nation-asunder-1861-to-1865/case-14-union-carbines/e-g-lamson-and-co-ball-repeating-carbine.aspx