'Caps of the Dioscuri' series.     AE As, c. 169-158 BC.   Obv.    Laureate head of Janus; above, mark of value I.        Rev.   Prow right; above, caps of the Dioscuri and before mark of value. Below, ROMA.     Cr. 181/1.     31.91 g.   32.50 mm.      R.  Rare. Uneven green patina, with reddish brown spots on reverse. Minor area of flatness on obverse, otherwise.    VF.