Diocletian Potin Tetradrachm of Alexandria.
Minted: Alexandria, Egypt
Size:  17mm  Weight:  7.24 grams
Obverse: A K GOYA DIOKLHTIANOC CEB, laureate, cuirassed bust right
Reverse: Rev: Eirene standing left holding olive branch and sceptre, date mark LS in left field.

Milne 4924. The coin features in the wildwinds database found at Wildwinds