Δ and KA (monogram of)

CILICIA. Seleuceia ad Calycadnum. Severus Alexander. Æ 28. A.D. 222-235. Obv: AV▪K▪M▪AVP▪CEOVHPAΛEZA-NΔPO. Radiate, draped and cuirassed bust right; 2 countermarks: (1) on chest, (2) partly under (1). Rev: CEΛE(-YKEΩN)KAΛY-KA-ΔNΩ. Tyche of Seleuceia seated left on rock in distyle shrine, holding grains; river-god Calycadnus swimming left below. Ref: BMC -; SNG Levante Supp. 196 (same obv. die, var. rev. leg.). Axis: 195°. Weight: 9.91 g. CM(1): Δ containing dot, in triangular punch, 6 x 5 mm. Howgego 670 (206 pcs). Note: Not likely to be a denominational countermark. CM(2): Monogram of K and A, in shaped punch, 4 x 5 mm. Howgego 618 (52 pcs). Note: The countermark likely refers to Calycadnum. Collection Automan.