Geta AE30 4-Assaria of Anchialus, Thrace. 

Rev: OVLPANWN AGCIALEWN, Demeter standing left, reaching out to touch a 
 tall diamond-shaped "basket torch" with serpent climbing it, and holding 
 parazonium, Delta between.

Image from N. Moushmov, 1912, Plate XX, 11.

Moushmov describes it as "Woman standing left, with right raised hand, holding 
 in left hand cornucopiae (?); in front of her – standing harpoon."

SNG Copenhagen calls objects like this "basket torches", but there is no 
certainty as to what they really are.