Watch List notes:

Postumus. Romano-Gallic Emperor, AD 260-269. AR Antoninianus (21mm, 3.84 g, 1h). Treveri (Trier) mint. 4th emission, AD 266. Radiate, draped, and cuirassed bust right / Salus standing right, feeding serpent from patera. RIC V 328; Mairat –; AGK 86; RSC 350a. EF, toned. Well struck, decent silver content.

From the Archer M. Huntington Collection, HSA 1001.57.4534.