Watch List notes:

Aes formatum. Cocoon-shaped AE solid cast Aes Formatum, Central Italy, 6th-4th centuries BC. Unlisted in the standard references and apparently unpublished; Vecchi ICC- (cf. "Bronze objects found with Aes Rude and early currency bars in Central Italy ", p. 76 and pl. 90). AE. g. 51.91 mm. 48.00 RRRR. Untouced earthen emerald-green patina. Good VF.

For the depiction of a cocoon on a cast Uncia cf. Vecchi ICC 312.