John Fritz
5th & Somerset Street, Philadelphia, Pennsylvania & Amana?, Iowa, United States.
Tรถpfer / Potter
He supposedly also worked at the Shaker Pottery in Amana, Iowa, circa 1856-1900.
Reference: Old South Jersey Glass
Side view featured stein. The handle is drilled for a lid fitting. It is unknown whether one was ever fitted. 
"Early Mettlach" style, earthenware stein.I am reliably informed that Mark Mager was the original owner. 
Basemarks on the featured stein. "John Fritz" "5th & Somerset Street, Phila." 