Watch List notes:

Anonymous. 4th-3rd century B.C. AE cast aes formatum (38x36x13 mm, 91.94 g). Cast bronze in the form of a cockle shell. Thurlow & Vecchi p. 20; Burgos P.28. EF, as made, green and earthen patina.

Called "aes formatum" by Haeberlin, this very rare bronze currency was a precursor to the issues of aes grave but later than aes rude.At over 90 grams, this is the largest I've handled in my 30 year career.