I am not sure of your question.  Are you asking for AR marks inparticular
or AR on m-m ware?  We (UDCAR) recovered a stoneware drinking jug from the
William Strickland Plantation Site (7K-A-117) in Delaware, circa
1710-1754. It was recoverd from a well that was filled in around the
1730s.

Cats, Custer, et al.
 1995   Final Archaeologcal Investigations at the William Strictland
Plantation Site (7K-A-117),  Delaware Department of Transportation
Archaeological Series, No. 119.

Hope this is of some help.

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