Postumus Billon antoninianus, Lyons.

IMP C POSTVMVS dot P dot F dot AVG, radiate, draped, cuirassed bust right.
FELICITAS AVG, Felicitas standing left, holding caduceus 
and cornucopiae.

RIC V-II Lyons 58 var (dots in legend); Sear 10936 cvar (ditto); Elmer 335, Cunetio hoard 2414-2415; Normanby hoard 1332.

Scarce with the dots in the obverse legend

With permission of Nathan, (ebay: holding_history), Dec. 2012.