My wife works part time at a local Civil War museum. They were thinning out there collection and had this little beauty for sale. It was in such nice condition that I couldn't pass it up.
From some internet research, I believe it is a Nettleton and Raymond chainstitch machine from about 1857-1858. They were made in Brattleboro, Vermont. Its quite portable, only about 10" long.
Its cute as a button though !