Pottery with a raised Marking

[detectorFRED]

Hello, I found this in South Eastern Pennsylvania near a stream. Raised Marking? Any one recognize the style, material or mark? Thanks

 

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[creskol]

That's an oldie! Almost looks like fired clay.

 

[detectorFRED]

Like 100 years old?

 

[creskol]

Like 100 years old?

Judging by the striations on the inside and the porosity of the material, I am guessing it is older than that.