Neo Genesis grey 1st edition cards

[niimou]

I've had a couple cards from Neo Gen. for a while (a Pikachu and a Sudowoodo) that were printed with a very faded first edition stamp. Now I want to know how much they are worth, but no one seems to have even heard of them! I swear I pulled them out of boosters back when I was 12..

..have you heard of them?

 

[Politoed666]

...Just how faded is the first edition stamp? Do you think it's an error, or are the cards just worn out?