[RolandF]

That´s really interesting. One sees how easy a "0" can be lost - many of us will have experienced this with the new European SEPA banking system. Especially on Ju 290s there are photographs of two-digit WNrn painted on the completely camouflaged fuselage on the port side beneath the cockpit.
And not to forget the peculiar application of 6-digit WNrn on the tailfins of the Ar 234. The first three digits written small (thus obvoiously the "unimportant" part) and the last three digits with large numbers - obvioulsly the "important" digits.

Regards

Roland