Æ 27mm diameter, 11.15 grams.  IMP C DIOCLETIANVS P P AVG His laureate head right.  Rv. GENIO POPVLI ROMANI Genius with modius on his head standing left, holding patera and corcucopiae, H in field to left, ANT in exergue.  RIC 58a.   Reverse has slight signs of double striking, otherwise almost Extremely Fine - EF