Watch List notes:

Hostilian. As Caesar, A.D. 251. AR antoninianus (23 mm, 3.72 g, 12 h). Rome, under Trajan Decius, A.D. 251. C VALENS HOSTIL MES QVINTVS [N C], radiate and draped bust of Hostilian right / MARTI PROPVGNATORI, Mars advancing right, holding spear and shield. RIC 176c; RSC 13. Choice very fine.