My bottle of Kouros was purchased at Target about 6 months ago. It is not the sillage/longevity monster I remember from years ago. While it is by no means "weak", I definitely don't need to be extra cautious about overapplying. Also, the silver bottom of my bottle was scratched up as well. The "s" looks more like a reversed "z" (but with a little more curve to the corners.) I just assumed the font was a bit stylized to make it look like more like an ancient Greek etching.
Smells great, though.
PS: The "s" on my recently purchased Kouros Fraicheur is also stylized.