Pete,
When I collected E104 I felt that there wasn't really a large premium for the nadja backs, but that collectors would love it if they came across one. I would've paid more for one and I know a couple other collectors (back then) that would have too. The cards from type 2 and especially 3 are so tough that any addition to your collection is significant, whether it's blank or nadja.
However, as you know, it's clear that the nadja cards are way tougher and deserve a premium. Just not enough folks collecting them out in the open to determine if they're getting one.
I still think that type 3 E104s are the most intriguing caramel issue because of the possibility of new additions...maybe even hof additions.
Rob
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