Septimius Severus, AE26 4 Assaria of Kallatis, Thrace. AVT K L CEP SEVHPOC P, laureate head right. KALLATIANWN, Coiled serpent with head erect. Delta in upper right field. Varbanov 296 (this coin). Used with permission of Numismatik Lanz, Auction 112. Feb. 2011