Old ship part?

[DocBeav]

Found this on the beach last week and have it posted on the "What is it Forum" and have had some people weigh in but still have nothing certain on what it actually is. Figured I'd post it here to see if any of the ship experts could weigh in and see if thy have some ideas. Thanks for looking!
http://www.treasurenet.com/forums/what/334836-old-copper-end-cap-need-help-iding.html

 

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