It is a pretty standard Boss game gun, built mid 1926, straight grip checkered butt , splinter forend, DT, standard frame( not rounded), 29" chopper lump Whitworth, very clean metal with 85% original case color and very sharp clean rose & scroll Sumner engraving, weight 6lbs. 10 ozs., smooth concave rib with 13 Dover St., Piccadilly address, 2 3/4" opened from 2 5/8" at some point, .732" bores, MWT .028": .029", and wood is close to, if not exhibition quality. Probably made for the American market as it ended up at A&F in 1931 and was sold secondhand to A. H. Scaife, who married into the Mellon family. His initials are on the shield. Anyway,a clean, unmessed with example, except for chambers.