59 BC.  Roscia 3. L. Roscius Fabatus (Cr 412/1 "64 BC")
    head of Juno Sospita right in goat-skin headdress, double cornucopiea behind
    /girl and large snake face each other, FABATI in exergue

Hersch and Walker ANSMN 29 (1984) redate this issue to 59 BC (from Crawford's 64 BC).
Note that both the imitation and the official piece have thin, shallow, knife-like serrations.
This piece shows even serrate coins can be plated.
  17 mm. 6:00. 2.37 grams

  AR17. 7:00.  3.95 grams.