This is a very nice J.P. Clabrough & Bro.10 Gauge percussion hammer gun San Francisco marked. It has 30” Lamented Steel barrels and 14 ½” LOP. The weight is 8 pounds 9 ounces. It has platinum blow out breech vents on each chamber side. It is a nicely engraved percussion shotgun. The mechanical function is very good and the bores are good plus but do show traces fine corrosion near the muzzle.