Septimius Severus AR denarius, engraver's error. AD 194-195, Emesa. 

IMP CAE L SEP SEV PERT AVG COS I (instead of COS II), laureate head right.
BONI EVENTVS, Bonus Eventus standing left, holding corn-ears and 
dish of fruit.

RIC 369 var (obv legend); RSC 68 var (ditto); BMC 344 var (ditto).

With permission of numislanz.de, Auktion 102, lot 675