A heavy spear (lance) head ... or what?

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I agree that this is most likely 18th C and from the American Revolution. Perhaps a spontoon. I have a similar one in my own collection , tho' admittedly w/o the conspicuous socket rim . There are some examplesl in Swords and Blades of the American Revolution which share some of these characteristics. In the case of my own one the shaft is covered in animal skin, possibly deer , which is stitched on.