On the obverse the head of Jupiter ; on the reverse, an eagle bearing a thunderbolt ; the letters AE (AES) signify that the piece is bronze money, and the five 00000 that it was a quincunx ; that is to say, that it weighed 5 oz., the as libralis or Roman pound weighing 12 oz. Rome never struck the quincunx ; they are only found in the South of Italy"