Caracalla, AE28 of Pautalia, Thrace.

AVT K M AVR ANTWNINOC, laureate, draped, cuirassed bust right.
HG KAIKINAK LAPGOY OYLPIAC PAYTALIAC, trophy between two
captives, seated on shields, with hands bound behind their backs.

Not in Ruzicka, Moushmov, Mionnet, Imhoof, etc.
This reverse type is known for Caracalla from Nikopolis ad
Istrum (AMNG 1581).
Slavey Ancient Coins online shop, item 1373.

With permission of www.slaveycoins.com, March 2012.