Watch List notes:

BOEOTIA. Thespiai. early-mid 4th century BC. Obol (Silver, 10.5 mm, 0.91 g). Boeotian shield. Rev. Θ-Ε-Ϟ-ΠΙ Two vertical crescents back to back; all within an incuse circle. BCD Boiotia 591 (this coin). BMC 1. SNG Copenhagen 398-399. Clear, well-struck and toned. Minor die breaks on the reverse, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, and from the BCD Collection, Triton IX, 10 January 2006, 591.