I used to own a beautiful though time-worn english shotgun, a 12-gauge damascus double with side hammers, Greener lock. Birmingham Proofs. The only thing that might have been the maker's name was the inscription J.Stevens on the side. I haven't been able to find any information on J.Stevens but I figure this would be the place to ask.
I can't give a lot more detail because I was under the mistaken impression that the gun could not be fired because of the damascus barrels and eventually sold it. Now that I know better I am trying not to kick myself for parting with it...