I am trying to find out some information on a sxs shotgun . On the side plates engraving (bird dog and pheasants) with the word POWELL there as well. Under the breech area ther is the words B.J.W. & Co., along with a possible serial number. Two sets of makers marks. This gun has double triggers and s-type hammers. Firing pins appear to be of a pin (nail) type. The gun was purchased between 1860 and 1865 new.