If anyone has the time or inclination to look up the Bonehill Patent of 1878 for his design of a hammerless action, there may be reference to this indicator on the side of the action. Presumably the pointer is affixed to the tumbler pin/axle (just guessin').
You are indeed quite correct Mr. greener, that is no A&D boxlock. I tried to look at the link Tinkerer provided yesterday and it would not load, today it did. Pretty good pictures in Crudington and Baker volume 2 as well. I tried to scan the pics but it did not come out well, pg. 90 and 91 in the 1989 edition. I was completely wrong about the gun being a typical boxlock, though it appears that both the sear and the hammer position remain consistent the A&D design and the main difference is how the barrels manage to cock the hammers.
