https://www.moneta-coins.com/showphoto.php?photo=3545&title=romescallop-shell-aes-formatum7e-400-bce&cat=539
Rome - Scallop Shell Aes Formatum ~ 400 BCE - Museum Gallery
ROMAN REPUBLIC: Anonymous, AE aes formatum (62.46g), uncertain Italian mint, ca. 500-300 BC, cf. ICC pl. 90, 4-5, 37 x 37 x 14mm, cast in the form of a scallop...
scallop shellmuseum galleryromeaesformatum