Caracalla, AE19 of Serdica, Thrace.

AV K M ANTW, laureate, draped, cuirassed bust right. 
CER-DWN above and beneath lion walking right. 

Varbanov 2110 (this coin); Ruzicka 399; Sofia 234.

With permission of Numismatik Lanz, auction 97, Spring 2000.