Something new. Jonathan Hunt 1829-37. I think he was in the Lummus article. I'm very happy with the condition of this, only one pen knife has been snapped off the rest is pretty much all there and working. I'll make a video when I have time, I don't think anyone has documented the sheffield mechanism on youtube.
http://i433.photobucket.com/albums/q...psvpg52bjm.jpghttp://i433.photobucket.com/albums/q...psflpkra2c.jpghttp://i433.photobucket.com/albums/q...pspen3elc1.jpghttp://i433.photobucket.com/albums/q...pshtkjxma5.jpghttp://i433.photobucket.com/albums/q...pshcb6gq1g.jpghttp://i433.photobucket.com/albums/q...psziip2uxt.jpg