So far, nothing on our catalog.
But found a clue, bronze/copper tetradrachms from Alexandria are similar to yours.
Here's an example: N#143973
Ah, and the reverse lettering is L S, it's a greek form of writing a regnal year.
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After searching on RPC and Wildwinds, this is the closest one:
https://rpc.ashmus.ox.ac.uk/type/76065
Which is kind of a variant of the coin I linked above, there are specimens with both L and S at left of the figure and specimens with one letter at a side and the figure between them.
I think you can use this Numista entry we already have for entering your coin into your collection.
