Septimius Severus, AE29 of Kallatis, Thrace. 193-211 AD.

AV K L CEP CEVHROC P, laureate, draped, and cuirassed bust right.
KALLATIANWN, city-gate flanked by two battlemented towers, 
epsilon in exergue.
Unpublished, not in Moushmov, Varbanov, AMNG etc. for Severus. Moushmov 292 var (this reverse used for Caracalla).

possibly unique;

Contributed by Online Shop of the Forum Ancient Coins, Feb, 2013, item SH48188