

I’d guess that it is an exact replica of a different coin. If you look for pictures of Athenian owl tetradrachms (the ancient coin is a tetradrachm, but different times and places within the ancient Greek world had different designs) then you’ll see that there are lots of little variations. I haven’t found one that matches the euro design exactly, but you’ll get the idea
I would think so too, but I don’t think this image is actually from the mint. At least, I can’t find it on the Bank of Greece’s website. Their euro banknotes & coins page actually doesn’t show the national side of the coins at all, only the common side