Watch List notes:

Hostilian, as Caesar, AR Antoninianus. Rome, AD 251. C VALENS HOSTIL MES QVINTVS N, radiate and draped bust right / MARTI PROPVGNATORI, Mars advancing right, holding spear and shield. RIC IV 177b; RSC 15. 3.39g, 22mm, 7h.

Extremely Fine for this issue. Excellent reverse details.