What is the die axis of a Roman coin?
Excuse me, could you please clarify what you mean by the "die axis" of a Roman coin? Are you referring to the orientation or alignment of the design elements on the coin, such as the emperor's portrait or the inscriptions? Or is there a specific technical term related to the minting process that I'm not familiar with? I'm curious to understand your question better so I can provide an accurate and informative answer.