Posted By:
petecldJust going by the image I feel confident in saying it isn't a Nadja nor ever had the chance of being one. I would need to see the card in hand to say for sure but there really is no reason to call this a Nadja.
Of course every blank back on ebay is either a rare back or a "proof".
The only possible answer for SGC putting Nadja on the label is the submitter put that on the submission form and they used that.
Can't say it's anything but a mistake on SGC's part.