Caracalla (198-217 A.D.) - Silver Antoninianus - 26.24x23.65xmm, 4.56gr
Obverse - ANTONINVS PIVS AVG GERM
Caracalla, his radiate, draped and cuirassed bust right
Reverse - PM TR P XVIII COS IIII PP
Jupiter, naked, standing half right, facing right,
holding lightning bolt in right hand, sceptre in left.

Minted in Rome in 215 A.D.
Reference:
Mattingly, H & Sydenham, E.A., "Roman Imperial Coinage", Volume 4, Part 1 (RIC), p249, nr. 258a
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 4, p276, nr. 279
Seaby, H.A. & Sear, D.R., "Roman Silver Coins" (RSC), Volume 3, p74,  nr. 279
Hill, P.V., "The Coinage of Septimius Severus and his family of the Mint of Rome", p34, nr. 1465, variety Jupiter standing half-right
Mattingly, Carson & Hill, "Coins of the Roman Empire in the British Museum", Volume 5 (BMC), p453, nr. 110 var (↓ die axis)
Van Meter, D., "Handbook of Roman Imperial Coins", p194, nr. 4/2, variety Jupiter standing half-right
Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC),  p194, nr.44, (B15, O20, R103, T111, M2)
Quality: Very Fine+, with cracks in flan at and 4 and 10 o' clock