Watch List notes:

Herennius Etruscus, as Caesar, 249-251. Antoninianus (Silver, 21 mm, 3.62 g, 1 h), Rome, 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 a slightly worn reverse die, otherwise, about extremely fine.