Caracalla AE30 of Serdica, Thrace. 

AVT K M AVP CEV ANTWNEINOC, laureate head right. 
OVLPIAC CERDIKHC, Hygieia standing right, feeding 
serpent in arms.

Ruzicka 253; Varbanov 2400.

Courtesy of Antike Muenzen Auction, 2003.