Notable works of the school still extant are the famous archaic female statues found on the Athenian Acropolis in 1885-1887, the seated statues of Branchidae, the Nike of Archermus found at Delos, and the objects in ivory and electrum found by D.
Even in the Leiden papyrus the astronomical symbols for the sun and moon are used to denote gold and silver, and in the Meteorologica of Olympiodorus lead is attributed to Saturn, iron to Mars, copper to Venus, tin to Hermes (Mercury) and electrum to Jupiter.
The electrum coins of Lydia were of two kinds, one weighing 168.4 grains for the inland trade, and another of 224 grains for the trade with Ionia.
The oldest known coins are the electrum coins of the earlier Mermnads (Madden, Coins of the Jews, pp. 19-21), stamped on one side with a lion's head or the figure of a king with bow and quiver; these were replaced by Croesus with a coinage of pure gold and silver.
Subsequently electrum (an alloy of gold and silver) disappeared as a specific metal, and tin was ascribed to Jupiter instead, the sign of mercury becoming common to the metal and the planet.