Copper nail (?) in wood found on the beach in CT

[DukeBoxer]

I was detecting at the beach a couple weeks ago and got a signal and dug a a piece of wood. I broke the wood apart and this little guy came out of it. The 2 ends are hammered flat at the entrance and exits points of the wood. Can anyone explain if this is a copper nail and what sort of things would it be used for? It's definitely not brass, it came out shiny like a cleaned penny. I would assume it would be too soft for a nail but I obviously have no idea. Thanks!

 

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[Mudflap]

I used to build canvas and glass covered canoes and we used a lot of copper nails. That one you have there certainly is long.

 

[Tony in SC]

I would say copper rivet, probably boat/ship related.