The Proof Marks on the barrel flats would prove a lot. Also one of the top rib showing the legend and a close up of one particular proof mark of a very small crossed sceptre mark (if it has one) would date it accurately. First glance leads me towards the Midland Gun Company of Birmingham early 1900's as the actual Maker; that is judging by the general style. They sold guns to the trade so they turn up with all sorts of names. Otherwise it is a good solid looking hammer gun. Certainly doesn't have a Belgian look. Lagopus.....