I feel free to say that while the Carthaginian-theory is based on little more than one coin, Menzies has more than one argument to support his view. While I don't take all arguments he offers, his theory is still way more convincing than the Carthaginian ships exploring the Americas.
The most important reason being: it's not because you're a great ship-builder in the Mediterranean, ocean-worthy ships are being built by accident and by even more accident floated to the Americas. You'll need experience in ocean-ship-building techniques, in surviving at sea for a prolongued time, a decent plan to sail west (including mappers), and a good deal of luck to make it back alive.
kind regards,
Andy
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