Watch List notes:

CALABRIA. Tarentum. Circa 480-470 BC. Litra (Silver, 9 mm, 0.69 g). Cockle shell within a dotted border. Rev. Wheel of four spokes within a circular border. HN III 835. Vlasto 1107. Boldly struck and with a dark patina. Some roughness, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, ex Münzen und Medailen FPL 560, November/December 1992, 1, and from the duplicates of the British Museum, Naville V, 18 June 1923, 234.