Joe and Bob,
Thanks for the link and photo. I will take some digital pics and post as soon as the semester is over. This gun does not have the same nipple/strikers as the that in Bob's pics. They may have been changed over the course of a century and the patent number on the barrel flats is number 122. Could this be for the lock up rather than the strikers. I saw a similar lock up on Vinatgeguns Uk web site, a back action with a protrusion on the rear lump or lug that extends under and into the breech face.
John
