Due to a tightened relationship between Athens and Aegina, the Greek coin tetradrachm[30] was produced with a different weight standard, which was the "Attic" standard drachm[29], having of 4.3 grams.
Later this standard was widely spread because of the increased supplies of silver made by the Athens from the mine at Laurion, as well as due to the continuously raising dominance of Athens. In the time when Athens started becoming a super power, Aegina no longer was considered a sea force. Thus, since the mid-5th century BC, the island stopped stamping sea turtles on its coins, instead tortoises were used. The tortoise symbolized the decline of Aegina as a naval power.






