Caracalla (198-217). AR Denarius, 206 AD. Obv. ANTONINVS PIVS AVG. Laureate bust right. Rev. PONTIF TR P VIIII COS II. Mars standing left, holding reversed spear and leaning on shield. RIC IV 83. 2.77 g. 20.00 mm. Sharply struck, from masterly engraved dies, and superb. Lovely iridescent cabinet tone, with blue hues. EF.