Lid missing.

Flat bottom, slightly concave at center. Concave wall with concave moulding at base. Vertical flange for lid. Reserved: underside, horizontal top of wall and outer face of rim.

From the same workshop, P 3915 K 14:1. Similar, but even closer in shape to the series of concave saltcellars, 922-929: from Thasos, Ét. thas., VII, pl. 57, 47 (upside down).