In his catalogue (1927) of the coinage of Demetrios Poliorketes, Edward T. Newell was unable to assign to a mint a substantial body of bronze issues (Newell nos. 162-174), whose characteristic types were a youthful male Head in Corinthian helmet r./ BA, Prow r. On grounds of control iconography and die axis, Newell tentatively assigned these issues to a royal mint in Karia or nearby regions of Asia Minor. In light of recent excavation finds this paper reattributes Newell 162 and 163 to a hitherto unrecognized royal mint at Corinth. It proceeds to examine other Demetrean royal and Corinthian civic issues, demonstrating by conjunction and overlap of controls a high degree of interpenetration of local and royal minting operations at Corinth. The paper concludes by proposing a new model for understanding the minting operations of the Diadochoi, which emphasizes cooperation wherever possible with local Greek mints and civic personnel.