United States Coast Guard black powder cannon. Line throwing cannon (Lyle gun) fires a 18 pound projectile over 700 yards. They used these cannons to fire a line over the ship that was breaking up close to shore. They would then pull a larger line from the ship to shore and secure it for rescue operations. Line throwing cannons were replaced in the 1950's with rockets. Line throwing cannons were also used for ship to ship.
MFG. Sculler / Safety Corp. 122 broad St NY USA cast into the carriage. 3996 U.S.C.G. R.Y.C stamped into the end of barrel. 2 1/2 inch bore 28 inch barrel around 200 pounds. Steel and brass