Watch List notes:

Caracalla, 198-217. Denarius (Silver, 18 mm, 4.25 g, 1 h), imitation of a denarius of 213, uncertain eastern mint. ANTONINVS PIVS AVG Laureate head of Caracalla to right. Rev. P M TR P XVI COS IIII P P Serapis standing left, raising hand and holding scepter. Cf RIC 208 (for the prototype). Apparently unpublished and extremely rare. Struck on a particularly thick and heavy flan. Extremely fine.