The crab is surrounded in a dotted circle. To me it was clear as day, now the reverse I have no idea, I started searching for dolphins and fish, but I think I found a perfect match, and no I have not even received the coin yet lol. This is from Akragas, Sicily. Circa 425-406 BC. Crab facing, encompassed by dotted circle, Eagle head right. I have no other information, but I was wondering if you guys had any input! The obverse with the crab is a pretty strong giveaway! I think I did good for 15$!