J. Warren (Warren1983, pp. 38, 41, n. 76) identifies Group 4C.8 in the “monumental style“ as the final issue of the type, which ranges ca. 330-200 BCE.
“KC069 (Middle Hellenistic bronze coin of Sikyon).” In Kenchreai Archaeological Archive, edited by J.L. Rife and S. Heath. The American Excavations at Kenchreai, 2013-2024. <http://kenchreai.org/gaek/kc069>