Julius Caesar and Octavian AE19 Genuine?

I recently won this unusual coin in a group of five coins from Numismatick Naumann. It is a puzzling piece - appears to be genuine but cannot find it - which makes it much more likely to be an imitation. It is clearly Julius Caesar and Octavian or Augustus. If it is genuine it would sell for much more than I paid so it cannot be genuine. But where was it made? 4.38 grams, 19mm. - Maybe Augustus and Agrippa? Any ideas?

 

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Not the same coin I don't think, but similar. Authentic? I believe so.


AUGUSTUS (OCTAVIAN)
AE Dupondius
OBVERSE: CAESAR DIVI F, bare head of Octavian right
REVERSE: DIVOS IVLIVS, wreathed head of Julius Caesar right
Gallic or Italian mint 38 BC
30mm; 17.90 g
CR535/v1, RPC620v