Septimius Severus, AE17 of Nicaea, Bithynia. AD 193-211. 2.31 g. AY K L CEPT CEYHROC, laureate head right. NIKAIEWN, cista mystica with serpent emerging to left. Unpublished with this obverse legend combined with this reverse with serpent left. CNG 331, 159. With permission of cngcoins.com, auction 331, Lot 159, July 2014.