Somethings not right with that Scott...forearm release and pistol grip unlike any Scott I've ever saw.
jOe, you are the Scott man, but I have a Scott hammer-gun with a fore-arm release just like that one, but with a more elaborate engraving pattern. The pistol grip though, does look different from the one pictured on the Bertramco site, which may be a re-stock. The Scott on the Bertram site with the dog on the side-plate is pictured as the 'Australian Special' at page 31 of the W.& C. Scott & Son 1891 catalog.
Actually, my Scott looks a lot like that gun, but with a Swan or long-necked Goose or something on the lock plate instead of the dog. Mine is a little earlier than 1891 though because it has the 'not for ball' mark on the barrel flats...Geo