Kolophon, Ionia, AR quarter obol. 490-400 BC. 

Laureate head of Apollo right.
TE monogram, cicada to left, all within incuse square. 

Milne 33; Imhoof 14; Sear 4343 var (obv type) and 4345 var (cicada)

With permission of TimeLine Originals (www.time-lines.co.uk), July, 2011