Watch List notes:

Hostilian, as Caesar, 250-251. Antoninianus (Silver, 21 mm, 3.90 g, 12 h), Rome, 251. C VAL HOS MES QVINTVS N C Radiate and draped bust of Hostilian to right, seen from behind. Rev. MARS PROPVG Mars advancing right, holding spear in his right hand and shield in his left. Cohen 12. RIC 176a. An exceptional piece, fully lustrous and with a wonderful portrait. Virtually as struck.