Antoninus Pius Tetradrachm 138 - 161 AD mint Alexandria 

Obv: Head left. Rev: Nilus reclining; Metal: Billion 9.1 grams, 24 mm diameter. Condition: VG.

<Philae Island in the Nile>
History Egypt Antoninus Pius

Adopted by Hadrian as his heir with a smooth transition to power. Although the empire was in a period of prosperity the tetradrachms of Egypt were of low silver content because Egypt did not produce or have easy access to silver. The people of Egypt freely accepted the debassed coins at par value with a Roman denarius, although the metal value of the coins was substantially below the official worth of the coin. Future emperiors tried to use this acceptance as the justification for debassing coins elsewhere, but unlike Egypt debasement of coins always led to inflation.