Δ in circular punch

ARABIA PETRAEA. Petra. Septimius Severus. Æ 22. A.D. 193-211. Obv: (…)-CEOYHPON(…). Laureate head right; countermark on shoulder. Rev: (…)-MHTPOΠ(…). Tyche seated left on rock, holding trophy in right hand and stele in extended left hand (?). Ref: Spijkerman 28v; BMC -. Axis: 360°. Weight: 7.24 g. CM: Δ in circular punch, 5 mm. Howgego 801 (19 pcs). Note: May bave been countermarked during reign of Elagabalus, although this is uncertain since the coins of Elagabalus were too small to be countermarked Δ, and no coins were issued after his reign. Collection Automan.