Silver, 18.7mm, 3.89gram.  CAESAR AVGVSTVS DIVI F PATER PATRIAE (Counter-clockwise) Laureate head of Augustius right.  R.  C L CAESARES AVGVSTI F COS DESIG PRINC IVVENT (Counter-clockwise) Caius and Lucius Caesars standing facing, spears and shields between them., lituus and simpulum above.  C.42, RIC 206.  A little off-centre, otherwise VF