Watch List notes:

THRACE, Selymbria. Circa 492/0-473/0 BC. AR Obol (8mm, 0.68 g). Cock advancing right; helmet(?) above / Quadripartite incuse square. Schönert-Geiss, Bisanthe 41 (V6/R5); SNG Copenhagen –. VF, toned, some roughness. Very rare with helmet symbol.