Watch List notes:

Hostilian. As Caesar, A.D. 251. AR antoninianus (21.5 mm, 3.67 g, 12 h). Rome mint, struck 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 177b (Tr. Decius); RSC 15. aVF. Rare.