Pottery and porcelain of the United States : an historical review of American ceramic art from the earliest times to the present day (1893)
Barber, Edwin Atlee, 1851-1916 · New York : G. P. Putnam's Sons · leaf 433
sed in the clay. 5P Mark adopted in June, 1886, and used duringthe remainder of that year, impressed. In 1887 a flame point was placed above the% monogram to indicate that year, and one pointhas been added each year since, so that the datemark used on pieces made in 1893 possessesseven points. 5P…
Pottery, American · Pottery
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