10 x 6"
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Based on the photos and information provided, and subject to examination, this is:
An American studio salt-glazed stoneware bowl
Unattributed maker, early/mid 20th Century
with sloping sides and a green-gray glaze overall; unidentified mark underneath.
6 inches high, 10 inches diameter
*represents a fair-market value for auction purposes; retail or asking price may vary.