Watch List notes:

Herennius Etruscus, as Caesar, 249-251. Antoninianus (Silver, 22 mm, 4.50 g, 6 h), Rome, circa 250-251. Q HER ETR MES DECIVS NOB C Radiate and draped bust of Herennius Etruscus to right, seen from behind. Rev. PRINCIPI IVVENTVTIS Apollo seated left, holding branch in his right hand and resting his left elbow on lyre. Cohen 22 var. (PRINC on the reverse). RIC 146. Struck from somewhat worn dies, otherwise, virtually as struck.