Coin and diamond necklace, Bulgari 1970s

centring on a silver didrachm, Velia Lucanie, 334-300 BC, obverse with the Head of Athena right, in winged and crested Attic helmet, the reverse with a lion standing right on an exergual lione within a circular frame accented with brilliant-cut diamonds and rubies, to a graduated flattened curb-link chain, length approximately 39cm,signed Bulgari, numbered, maker's marks, the reverse with inscription