The light is 13 inches tall, or 18 inches including the iron wire bale.
General purpose lamps like this one were commonly seen aboard ship, in every foc'sle and lifeboat. Whalers carried large numbers of them for use on deck at night when cutting up a whale and "trying out" the whale oil.
This is a typical working light made of sheet iron that has been hot-dip galvanized to retard rust. It is marked "Proctor's Pat.1876" on its applied brass label. The light is 13 inches tall, or 18 inches including the iron wire bale. It has its iron font and early-style burner. There is a small hole at the top by the ring, probably drilled to cool the chimney. It is in wonderful condition, as if hardly used, and shows no rust or corrosion.
Very few of these once-common lights have survived. They were simply used up until they were gone. How this one managed to survive is anyone's guess.