Caracalla Sestertius. Rome, AD 212. Æ 30 mm. 21.3 gm. Obv: M AVREL ANTONINVS PIVS AVG BRIT, laureate head to right. Rev: P M TR P XV COS III P P, Mars standing facing, head to left, holding Victory, shield and spear; captive with hands tied behind back seated to left at his feet, S-C across fields. RIC IV 490Ca corr. (rev. legend COS III, not COS IIII); C. 198; BMCRE 235. Rare.