Elagabalus AE21 of Nikopolis ad Istrum. 

obv: AV K M AVP ANTWNINOC, radiate draped bust right 
rev: NIKOPOLITWN PROCICTPON, city gate with pointed arch and 
     two flat towers. 

Moushmov 1391; Varbanov 3827 (Engl.)

Courtesy of aeqvitas.com.