Watch List notes:

Hostilian, as Caesar, 250-251. Antoninianus (Silver, 21 mm, 3.94 g, 12 h), Rome, 251. C VALENS HOSTIL MES QVINTVS N C Radiate and draped bust of Hostilian to right. Rev. MARTI PROPVGNATORI Mars advancing right, holding spear with his right hand and shield with his left. Cohen 15. RIC 177b. The reverse struck from a somewhat worn die, otherwise, good very fine.