Large Chinese Clair de Lune Porcelain Brush Washer. Of compressed globular form, supported on a circular foot ring, the interior and exterior walls covered in light blue glaze, the recessed base glazed in white, bearing a six-character underglaze Qianglong mark in regular script, the foot pad left unglazed. {Diameter: 10 1/2 inches (26.7 cm) approximately}.