From a hoard found in Clazomenae, a number of "staters" (a standard measure) from the sixth century BC.
They are the only ones known so far with human figures. They may have been struck in the city Clazomenae itself. The material was a mixture of silver and gold, electrum. Enc. Britt.: The early electrum coinage consisted of small, thick, bean-shaped pieces, with a device stamped in relief on one side, the other being roughly impressed. Their intrinsic value fluctuated according to their gold and silver content; but the weight of the unit was fairly steady at about seven to eight grams, and the types stamped on them were the guarantee of authority.