543858 - 20 Zlotych POLAND 1990 P.168a

Surchargé NIEOBIEGOWY en rouge (non négociable), billets imprimés en Allemagne qui ont été retirés avant leur mise en circulation car pas assez sécurisés. La surcharge a été imprimée par la suite.
Overprinted NIEOBIEGOWY in red (non-negotiable), banknotes printed in Germany that were withdrawn before being put into circulation because they were not secure enough. The overprint was printed later