GR series.     AR Denarius, uncertain Spanish mint, 207 BC (?).   Obv.    Helmeted head of Roma right; behind, X.        Rev.   The Dioscuri galloping right; below, GR; in exergue, ROMA.     Cr. 169/1; B.  1 (Sempronia); RRSC B 91G.     3.93 g.   18.5 mm.      RR.  A good example for this very rare issue, clearly readable.    VF.