Thanks to Constantine for the alert on this one. The newest addition to my CONSERVATOR collection is this coin with a bust type that is not listed in RIC. It is a radiate and elaborately draped & cuirassed bust left.
Maximianus
A.D. 289- 290
Ӕ Antoninianus
22mm 3.6g
IMP C M A VAL MAXIMIANVS P F AVG; radiate, draped and cuirassed bust left.
CONSERVATOR AVGG; Maximianus holding sceptre, and Hercules, leaning on club; standing face to face, sacrificing at altar.
In ex. •A•XXI•HP•
RIC V Siscia 580