This error is similar to the very high catalog value note mentioned in the Nachtrag to Lindman vol. 4, a separately published addendum to the only catalog that exists for Notgeld envelopes, this is not the exact error mentioned. That error is just a missing number "2." by the letter U, but as you can see here, both the "2." and the "U" are gone, and the text is substantially altered as well!

GM 344.4 / Lindman 331d.

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