Small conical object, possibly a hat. Hollow cone flaring towards base.
A very similar object was found in the Athenian Agora (D.B. Thompson, Hesperia 21, 1952, pl. 39, no. 62), from a roughly contemporary ... Middle to 3rd quarter of the 4th c. B.C. (Stillwell 1948, Corinth 15.1, p. 43) ... KT