Countermark: sim. Howgego1985, pp. 4, 222, no. 589, pl. 23 (DD possibly related to DDCO=decreto decurionum Corinthiorum?; Early Roman, from Isthmia, IC 759), pp. 188-189, nos. 431, 432, pl. 17 (Augustus, Imbros; Tiberius, Aegina?).
“Co 255 (Early-Middle Hellenistic hemiobol of Ptolemy III from Corinth with countermark).” In Kenchreai Archaeological Archive, edited by J.L. Rife and S. Heath. The American Excavations at Kenchreai, 2013-2024. <http://kenchreai.org/ke/co0255>