The seal is attached to the wall of a plain flat bottomed bowl, P 14431 (X 988), rivetted through the clay just below the rim.
A seated figure (Dionysos ?) facing right; a high back to throne, and apparently ... 9-12 February 1937 ... Agora:Object:Head (1888), BMC Attica, p. 104, no. 758, pl. XVIII, 6.