Watch List notes:

Caracalla (198-217), As, Rome, AD 212; AE (g 10,50; mm 24; h 12); ANTONINVS [PIVS] - AVG BRIT, laureate head r., Rv. P M TR P XV - [COS] III P P, Mars standing l., holding Victory and resting on shield; behind, spear; in field, S - C. RIC 493a; C 200.
Brownish patina, about extremely fine.