Never head of Afghanic kush.
It's been maybe 3-4 years since I saw Afghan Kush in Amsterdam.
Lots of OG Kush and Lemon Kush about.
I've never seen Supernova at any Dutch Coffeeshop, only at the seed banks.
You could scan the menus online for Dutch cities outside Amsterdam.
http://www.coffeeshopmenus.org