Numismatik Naumann (formerly Gitbud & Naumann), Auction 91, лот 1061 The Plankenhorn Collection of Ionian Coins IONIA. Kolophon. Tritemorion (Circa 450-410 BC). Obv: Laureate head of Apollo right. Rev: TPI monogram (mark of value) in incuse square. Milne, Colophon, 30. Condition: Very fine. Weight: 0.29 g. Diameter: 8 mm.