Δ and NIKO

MOESIA INFERIOR. Nikopolis ad Istrum. Septimius Severus. Æ 27. A.D. 193-211. Obv: (VK)ΛCEΠ•-CEVHPOC (...) or similar. Laureate bust right; countermark (1) on shoulder. Rev: VΠAVP•ΓAΛΛOV•NIKOΠOΛITΠPOCIC. River-god reclining left, leaning against urn (?), holding branch in right hand; Countermark (2) to left. Ref: BMC -. Axis: 60°. Weight: 11.68 g. CM(1): Δ, incuse punch, 7 x 6 mm. Howgego 782 (3 pcs). CM(2): NIKO, incuse, 14 x 5 mm. Howgego 553 (3 pcs, 2 of which on reverse). Note: All coins that have the Δ c/m apparently also bear the NIKO c/m and vice-versa, so they must have been applied at the same time. Collection Automan.