This vintage copper air horn was removed from a ship destined for scrap at the shipbreaking yard.  Measures 14 1/4″ long.  The copper bell end measures about 5 3/4 inches in diameter and is mounted to a brass base.  The brass base has two screw holes that are about 5 1/8 inches on center. The box that the horn is mounted to measures 5 1/2 inches long by 4 1/2 inches wide. This horn is unmarked.  Working condition is unknown.  It has a bit of weathering from use on a real boat.