Goldmine on Kai Winkler's website?

[Laurens Q-fin]

Hello,

This evening, I subscribed on Kai's website to see the photos from what he's selling. In one of his listings I see the category "Goldmine" under "Knights Cross Winners Signatures and PostCards". Are the cards in this category really that special? Anyone here that already bought signed cards from Kai and wants to share an opinion?

Thanks,
Laurens