Watch List notes:

Postumus. Romano-Gallic Emperor, AD 260-269. Antoninianus (22mm, 3.83 g, 7h). Treveri (Trier) mint. 4th emission, 2nd phase, AD 267. Radiate, draped, and cuirassed bust right / Serapis standing left, raising hand and holding transverse scepter. RIC V 329; Mairat 130-4; AGK 90; RSC 360a. EF, good silvering.