Here is the cut-away drawing from the 1900 Baltimore Arms Co. catalogue showing the hanging sear --



By the 1902 Model the sear spring had been repositioned, but all I have of a later catalogue is a photocopy and it just doesn't show up well.

The earliest Baltimore Arms Co. guns had a plain checkered butt plate, as used by the predecessor Fox Gun Co., Balto., MD., U.S.A. By the 1902 Model they were using this butt plate --



I have couple of NOS butt plates that an old Baltimore gunsmith gave me along with some parts when I did a display of the guns at a Maryland Arms Collectors Association show. They are too narrow for any of my 12-gauge guns, but would work on 16-gauges.