✅ SOLVED What is it

[goldnrelics]

found at a colonial area along the Potomac river .....?? plate,lid,pos, ?? what is it

thanks in advance

its brass and the size of a regular cw eagle breastplate

 

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[JOHUNT]

it's a freeze plug probably from an old tractor, also known as core plugs or welch plugs

 

[goldnrelics]

nice thank you