Watch List notes:

SICILY. Akragas. Circa 450-440 BC. Litra (Silver, 10.5 mm, 0.63 g, 6 h). ΑΚ - RΑ Eagle, with closed wings, standing left on Ionic column capital. Rev. ΛΙ Crab. Westermark 483.2 (this coin). Attractive and clear, with greyish-purple surfaces as found. Extremely fine.
From the "Collection "sans Pareille" of Ancient Greek Fractions, ex Münzen und Medaillen FPL 527, November/December 1989, 4.

The ΛΙ von the reverse stands for the denomination.