214-217 AD. and later, Caracalla, contemporary imitation, Æ Antoninianus, cf. RIC 280e.

Caracalla, contemporary imitation ("limes falsum"), 214-217 AD.,
cast Æ Antoninianus (22-23 mm / 4,15 g),
Obv.: ANTONINVS PIVS AVG GERM , radiate, draped, and cuirassed bust of Caracalla right, seen from behind.
Rev.: P M TR P XVIIII COS IIII P P , Serapis, with polos on head, standing front, head left, raising r. hand and holding sceptre.
for prototype, cf. RIC IV, I, p. 253, 280e ; - Coh. 349 .

Curtis Clay: "G. Elmer invented the term "limesfalsa", which is now usually applied to ancient casts of denarii."