hi guys im looking for any info on a side by side hammergun made by A & E WADSWORTH Pontefract (England and local to me) . it has damascus looking barrels witch look twisted? and on the flats it has the number 13. on one of the flats it says choke and on the other an upside down looking 7? in the same place. there are also what looks like a hammer and pick axe crossed. the proof marks look like a crown with what looks like bp underneith. is this gun black powder only? the serial number is L526any info would be greatly recieved.

thank you.