Caracalla, AE30 of Serdica, Thrace. AD 198-217. 16.99 g.

AVT K M AVR ANTWNINOC, laureate, cuirassed bust right, 
aegis on chest.
OVLPIAC CERDIKHC, emperor standing left, holding Nike
and parazonium, crowned by Tyche standing left behind
him and holding sceptre.

Ruzicka 341 var (has a prisoner at foot); Moushmov 4868 var (ditto); Varbanov - (lists only "crowned by Nike" types). 
Very rare.

With permission of Numismatica Ars Classica, May 2015.
Estimate: 1,000 SFr.