Recommend you check the spelling again.[ Spurious guns were a problem to the English gun trade of the period, but spelling mistakes have also been encountered!] If the gun has Birmingham proof marks, the name was almost certainley a spelling error and should read"Redfern." The Redfern family of gunmakers was active in Birmingham 1799-1850.I suspect the most likely maker was; Thomas Redfern' 1837-1850.

Roy Hebbes