Attica, Athens. Tetradrachm; Attica, Athens; 510 BC, Tetradrachm, 16.87g. Seltman-370, Svoronos-pl 5-23. Obv: Helmeted head of Athena right with full crest. Rx: Owl standing right, head front; olive sprig at upper left, ΑΘΕ downwards on right, all in incuse square.This coin combines a worn obverse, that was used with many reverse dies, with a virtually mint state reverse of the type, used in future tetradrachms minus the crescent moon. This was the end of the experimental issues of the so called "civic mint" with a decision made that these would be the regular issues of Athenian tetradrachms. VF / Choice EF