Watch List notes:

BOEOTIA. Thebes. Circa 480-460 BC. Tetartemorion (Silver, 6 mm, 0.20 g). Boeotian shield. Rev. ⨁ in incuse square. BCD Boiotia 357. Berend p. 23, 7. HGC 4, 1373. Clear, sharp and toned. Minor pitting, otherwise, about extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions.