Watch List notes:

Hostilian. As Caesar, AD 250-251. AR Antoninianus (22mm, 3.59 g, 12h). Rome mint, 5th officina. 6th-7th emissions of Trebonianus Gallus, AD 251. Radiate and draped bust right / Mars advancing right, holding transverse spear and shield. RIC IV 177b; RSC 15. Near EF.