Small fruit, pomegranate or poppy head. The model had initially been considered to be a pomegranate. However, the dentate calyx, the characteristic connection between the plant’s stem and the spindle with the soft grooves indicate that it is most possibly a poppy head.
Poppy is Demeter's sacred plant as well as a fertility symbol because its head contains hundreds of tiny seeds. Poppy flowers were used to decorated the goddess’ statue during the Eleusinian Mysteries. According to mythology, because of her love for Mekon from Athens, Demeter transformed the man into a poppy to ensure their eternal co-existence as these wild flowers grow like weeds among grain.
De Ridder, A., Bronzes Trouvés sur l' Acropole d'Athènes, Paris, 1896, σελ. 39-41, εικ. 13, αρ.κατ. 114 Jacobsthal, P., Greek pins and their connections with Europe and Asia, Oxford, 1956, σελ. 187