Watch List notes:

Valerian I, (A.D. 253-260), silver antoninianus, Viminacium Mint, issued 253, (3.38 g), obv. radiate cuirassed bust right, around IMP VALERIANUS P AVG, rev. SALVS AVGG around, Salus standing right feeding serpent held in her hand, (S.9974, RIC 251, RSC 200). Extremely fine, very scarce type from this mint.