Can you identify these?

[dbach149]

My father found these on the beach in Ocean City MD. Between 139th St. and Fenwick Island . They appear to be copper.

 

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[DainBrammage]

Think what you wish. However, I assure you I am correct in this matter.

 

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[mitchellf]

Kinda looks like frag . the texture looks like the outside of a frag grenade.