Caracalla Brass AE29 of Serdica, Thrace. 

Obv: AVT K M AVP ANTWNEINOC, laureate, draped & cuirassed bust right 
Rev: OVLPIAC CEPDIKHC, Demeter standing left, holding ears of corn over a 
 half-opened cista to left with a serpent emerging, and holding long torch 
 entwined with another serpent. 

Moushmov 4836, Hristova/Jekov, Serdica, p. 66, first two coins on page (same dies)

Contributed by Steve Niederloh (CelatorsArt.com), August, 2007.