Watch List notes:

Ionia, Erythrai AR Tetartemorion(?). Circa 500-480 BC. Rosette with central pellet / Incuse square. Unpublished in the standard references; Roma e88, 409; cf. SNG von Aulock 1941 (electrum); cf. Leu E-1, 526 (hemiobol); cf. CNG e319, 76 (same). 0.20g, 6mm.

Good Very Fine. Extremely Rare; an unpublished fraction, only one other on CoinArchives.

From the inventory of a UK dealer.