I'm stabbing a bit here, but the position of the rear pin on the locks, high up against the back of the lock-plate, tends to suggest Baker locks, characterised by coil mainsprings. Have you had the locks off, Lou? If they are Baker locks, this might suggest the Daemon Gunworks, as they appear to have made a bit of a specialty of those locks. It would pretty-much rule out WW Greener. If the words 'English Made' appear a bit further up the underside of the barrels, this might add further weight to the Daemon Gunworks origin, but there are few certainties in the Birmingham gun trade!
