Silver 3.28 g., 20 mm; Obv: FRANC . I . ET PER EVM FERD . V . The conjoined heads of Francis I, laureated and Ferdinand, his son, right. Rev: CORON . POSON . DIE XXVIII . SEPT . MDCCCXXX . A crown is in the field. From behind it radiates lines, possibly representing the sun.; AUNC