Featured Claudius I & his mother Antonia: only my second Roman Alexandrian before the Nerva-Antonine Dynasty

Thank you for this fascinating discussion. Interestingly, my Nero Year 12 Alexandrian tetradrachm, which I posted together with the Claudius-Antonia, was obviously issued well after the debasement you mention, but still looks far more "silvery" than any of my Alexandrian tetradrachms issued by Hadrian or Antoninus Pius in the following century.

 

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And for good reason. As the denarius lost more and more of its silver content during the second century, so did the tetradrachmas of Alexandria, probably because if the Alexandrian coins were not equally debased a tetradrachma would have had a higher silver content than a denarius.