i would expect to see the bond street address on Mr Stallone's gun as it bears a strong resemblance to a top lever back action I had once.

issue three of Shooting Sportsman's digital magazine had a great article on the maker. Unfortunately we were not allowed to save the files.

the original poster's question was about a Moore and Co, i would doubt that is a Wm Moore, there were other Moores building guns, I remember a Charles for one, not sure how his were marked.