Myndos, Caria, AR drachm, 2nd century BC. 4.08 g. Magistrate Herodoros.

Laureate head of Zeus right.
MYNDIWN HRODwROS upwards to left and right of headdress of Isis. Dolphin swimming right below.

Apparently unpublished with this symbol. Tradart 21, 57
BMC 3 var (symbol); Myndos Hoard 65 var (ditto); SNG Cop 439 var (ditto). 

Sold by Tradart, Belgium, auction, lot 57 Feb. 2018.