Piece of pottery needs I.D. if possible

[digthis]

Found this on top of the ground while metal detecting after a farmer disked the field, Said to be a old turpentine mill at this location north of Savannah ga. The blue area is 3x2 inches roughly by almost 1/2 inch thick, I'm thinking a butter churn lid or something similiar. tia steve

 

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[tennessee digger]

Not sure about the ID, but it does look old.