I agree it is Nero. The bust on the reverse is a draped bust of Alexandria wearing and Elephant skin head dress. the coin is dated LIB for year 12. Reference Sear 2004, RPC 5289. It's a tetradrachm from Alexandria.
BTW, as a side note, that red encrustation as seen on the coin is not unusual on the billon tetradrachms that have a fair amount of silver content. I am not a metallurgist or chemist but I have handled a few hundred of the Roman Egypt tetradrachms and seen many many cases of the red encrustation.
Quote: ...that red encrustation as seen on the coin is not unusual on the billon tetradrachms...
Agreed. The red is actually verdigris which sometimes manifests as a red deposit rather than the usual green. It responds to the bronze in the billon, not the silver (silver coins can get horn silver but not verdigris; bronze and billon coins can get verdigris).
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