Diocletian, AE18 potin tetradrachm of Alexandria, Egypt. Dated year 10. AD 293-294. 6.81 g.

DIOKLHTIANOC CEB, laureate, cuirassed bust right.
PERIO-DOC DE-KATH, legend in three lines within wreath.

Dattari 5789 (this coin); Milne -. 

With permission of Naville Numismatics auction 52, Lot 361, Sept. 2019.