IONIA. Kolophon. (Circa 450-410 BC). AR Tetartemorion. Obv: Facing head of Apollo with long hair. Rev: TE monogram (mark of value) in incuse square. Milne, Colophon, 7; SNG Kayhan 356. Condition: VF. Weight: 0.26 g. Diameter: 6.8 mm.