Watch List notes:

Postumus. Romano-Gallic Emperor, AD 260-269. Antoninianus (21mm, 3.49 g, 1h). Mint I. Group IVa (AD 266). IMP C POSTVMVS P F AVG, radiate, draped, and cuirassed bust right / SALVS EXERCITI, Aesculapius standing facing, head left, leaning on staff round which snake coils; globe at his feet, to right. AGK 85 (s); RIC V 326; Cunetio 2433. VF, toned, underlying silver, small flan crack.

Ex Jacquier FPL 13 (Autumn 1991), no. 306.

The reverse legend on this and the following coin is ungrammatical. 'Exercitus' (army) is a 4th declension noun, with genitive 'exercitūs'.