Watch List notes:

IONIA (or CARIA), Uncertain. Late 6th - early 5th centuries BC. AR Tetartemorion (5mm, 0.21 g). Milesian standard. Head of eagle left / Incuse square. SNG Kayhan 739 (noted as "apparently unpublished"). Toned. VF. Very rare.

SNG Kayhan notes that their piece was reportedly found near the cite of Magnesia on the Maeander.