Your photos are not sharp enough for any comments other than unsupportable guesses. Here are my unsupportable guesses: Based on the only two features that I can visually discern from your photos -- the uncommon roundness and high degree of centering -- I have my doubts that your coin is authentic. The sand-like patina also appears to be artificially applied. You'll get better opinions if you post in-focus, sharp pictures.
The Roman Empire Octavian as Augustus, 27 BC – 14 AD. Divus Augustus. Dupondius circa 22-23, Æ 16.14 g. DIVVS·AVGVSTVS·PATER Radiate head of Augustus l. Rev. S – C Hexastyle temple with sharply domed roof surmounted by standing figure and flanked by columns bearing calf on l. and lamb on r. C 251. BMC Tiberius 142. RIC Tiberius 74. CBN Tiberius 146. Very rare and an issue of great interest and fascination. Dark green patina somewhat smoothed, otherwise extremely fine / about ex... 24 Oct 2017 5,500 CHF not my coin a example real one hard to see from picture fake of not, my feelings are not good