Some time back I read an account of this, written by the William Richards Company of Liverpool themselves. Unfortunately I did not save it.

Bottom line was "IF" it was made by W Richards of Liverpool, there will be no question as to its origin. If there is a question it was not made in Liverpool.

The "London Fine Twist" marking is not correct for a Liverpool gun. It would be correct for either a Birmingham proofed J P Clabrough or a Belgian Pieper gun.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra