Thanks for the discussion of an interesting but little known American trade gun. I looked at the picture, saw the hook at the top of the frame, and said "that's a Syracuse" and forget the thread till I came back and read what your research and knowledge turned up.

Comparing the pins in the sides and the bottom of the frame, my SAC ia way different from the gun shown. And besides my Bakers are all sidelocks. You have to pay attention around here!..Geo