Thanks Pete. What date would that have been? The gun was likely made 1878-80. Maybe Riley was a rugby fan, or Reverend Wigg a shotgun fan.
MP, that is too cool the way you pulled up the patent drawing so fast. I don't really understand how a lever could put the hammers on half cock when breaking open the gun. Now I wish the missing part was still there even more. If I could find some good pictures of an original gun I would be tempted to have a replacement made to take the gun back to its original design. Thank you very much.