ellenbr
At one time I had in my collection a 12G double, top lever hammer gun by C.H.Smith,Steel House lane, Birmingham, made circa 1900. This gun had barrels marked Rose Bros, According to my records,the barrels were single iron twist or Single iron Damascus twist. The gun in question was low end selling for about 7 pounds stirling at the time of manufacture.
C.H.Smith was still in business in Steel House lane circa 1950, In fact I visited the shop during my student days in Birmingham.

Roy Hebbes