My W.H. Wilson, London, double flintlock 16 gauge made about 1815 with grip safety. Gun is in exceptionally high original condition. Has virtually every refinement ever put on a flintlock. Very modern stock dimensions. By this time the double shotgun had reached its final form and has not changed significantly since then.
I cannot imagine the human skill required to make two identical locks such as these, mirror images of each other, made with nothing more than files, chisels, and a lifetime of working towards perfection. No machinery whatsoever!