Watch List notes:

Hostilian, as Caesar, 250-251. Antoninianus (Silver, 21 mm, 3.48 g, 12 h), Rome, 251. C VALENS HOSTIL MES QVINTVS N C Radiate and draped bust of Hostilian to right, seen from behind. Rev. MARTI PROPVGNATORI Mars advancing right, holding spear with his right hand and shield with his left. Cohen 15. RIC 177b. Very fine.