Wm Moore made some nice guns, he apprenticed to Joesph Manton, the father of the modern game gun.
the marque had a couple variations -My Wm Moore & Grey was my first hammer gun and my first damascus. 30 inch tubes straight stock with very modern dimensions (i added a leather covered pad ), it weighs about 6 1/2 pounds and is a joy to carry
Shooting Sportsman's e magazine Sporting Shots did a good history on him in one of their early issues, but unfortunately those could not be saved.
PS - here is a link to some of the maker's history
http://www.doublegunshop.com/forums/...=353843&page=2