Maryland Beach find. Guesses?

[Dbat]

Hi, I found this on the beach in Maryland today. It feels heavy like metal but it’s not attracting to my magnet. Any ideas of what it is/age? Some type of fastener? Thx!​

 

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[Digger RJ]

Hi, I found this on the beach in Maryland today. It feels heavy like metal but it’s not attracting to my magnet. Any ideas of what it is/age? Some type of fastener? Thx!​

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