At first glance the reverse of this coin looks like the common type of Jupiter presenting victory on globe to Emperor, but this reverse is Victory presenting a wreath to the Emperor.
Diocletian
A.D. 284
Æ Antoninianus
21mm 4.4gm
IMP C C VAL DIOCLETIANVS P F AVG; radiate, draped & cuirassed bust right
IOVI CONSERVATORI AVG; Victory walking r., holding palm, presenting wreath to Diocletian stg. l., holding globe and sceptre; TR in center
in ex. XXI
RIC V Tripolis 330