I have several sideplate Lefever shotguns that are equipped with a small brass mid-bead. They look to be original. But I have never seen any reference to them in the factory catalogs. One of my Fox Sterlingworth guns has two ivory beads, which identifies it as a Sterlingworth deluxe.
Hibbard, Spencer, Bartlett & Co. catalog 1895
Old pictures and advertisements can sometimes be interesting. But the ad above is no more germane to the subject of mid-beads than this:
Note: I am not selling a Forehand revolver or advocating shooting dogs here. But it would have been handy to have when I delivered papers as a kid, and was bitten by dogs four times that drew blood. I used a Wham-O slingshot to fend off many other dog attacks So if you buy one as a result of this ad, please send $12.00 to Dave Weber...