Diocletian. Potin Tetadrachm of Alexandria, Egypt. Dated Year 8, AD 292-293. 6.79g. 

DIOKLHTIANOC CEB, laureate head right.
L-H, Zeus seated left, holding patera and sceptre, eagle at foot left. 

Milne 5051; Dattari 5780. 

Sold by Malter Galleries, 1999.