Caracalla (198-217 A.D.) - Silver Denarius - 17.66mm, 3.09gr
Obverse - ANTONINVS PIVS AVG BRIT
Caracalla, his laureate and bearded head right
Reverse - P M TR P XVI COS IIII PP
Hercules, standing left, holding olive branch, club and lion's skin.

Minted in Rome in 213 A.D. (TR P 16, COS 4)
Reference:
Mattingly, H & Sydenham, E.A., "Roman Imperial Coinage", Volume 4, Part 1 (RIC), p241, nr. 206a
Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol. 2, p521, nr. 6828
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 4, p167, nr. 220
Seaby, H.A. & Sear, D.R., "Roman Silver Coins" (RSC), Volume 3, p73,  nr. 220
Hill, P.V., "The Coinage of Septimius Severus and his family of the Mint of Rome" (CSS), p33, nr. 1357
Mattingly, Carson & Hill, "Coins of the Roman Empire in the British Museum", Volume 5 (BMC), p438, nr. 48 (↓ die axis)
Van Meter, D., "Handbook of Roman Imperial Coins", p196, nr. 60/2.
Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC),  p195, nr.89, (B05, O18, R118, T215, M2)
Quality: Very Fine