18th century probably American. 79” length with hand-hewn wood haft rounded on the bottom in consideration of the ship’s decking. Forged iron head with residue of protective pitch and red lead paint. Tapered socket necked below the elongated pyramidal tip. The point of the tip formed as a tapered screw capable of embedding itself in the hull of an oak hulled ship. That could provide a step for a boarding party, deliver an explosive charge or serve a variety of other tasks assisting the boarding process. Note that the Turtle, experimental submarine, attempted to affix explosive to the hulls of ships in 1776 by boring with a similar screw. This example is unique in our experience and dated by its construction and evidence of age.