Constantine II AE3. Struck in error, 320 AD.

Obv: CONSTAN-TINVS AVG, laureate, draped, cuirassed bust right
Rev: DOMINOR dot NOSTROR dot CAESS around VOT V within wreath, star below V, SMH<font face="SYMBOL">D</font> in ex.

RIC VII Heraclea 63 var (emperor), unlisted mule, very rare.

RIC does not list this coin for Constantine, as at the time, Constantine had been ruling for over 15 years, so would have the legend VOT XX (RIC 60, 64, 66). The bust is too old for him to be celebrating his V year of rule. This is possibly a mule with the reverse of Constantine II. 

Contributed by Dane for George Clegg (biggyg2), June 2009