Thank you everybody for your responses! So we might never know the WN.r. But... we are still free to make educated guesses. Let's remain optimistic.
We do have the ebay photo as a reference, so we are not empty handed at all. Perhaps in the future, we'll learn more.
So for my model I would just like to ask whether in your opinions, I should paint it in the mid-war grays overpainted with a heavy green mottle. Based on David's comments this would seem very possible. Claes certainly agreed. I realize this question is tied in with the WN.r, so any interpretations are speculative. That's okay! All views are welcome.
Best regards,
Jon