b97_1773 - 20 Zlotych POLEN 1990 P.168a

Surchargé NIEOBIEGOWY en rouge (non négociable). Billets imprimés en Allemagne mais ils ont été retirés avant circulation car pas assez sécurisés. La surcharge a été imprimée par la suite..
Overprinted NIEOBIEGOWY in red (non-negotiable). These notes were printed in Germany, but were withdrawn before circulation as they were not secure enough. The overprint was printed later.