People's Republic. American Bicentennial. 500 Zlotych, 1976 MW. Tadeusz Kosciuszko; 500 Zlotych, 1976 MW. Kazimierz Pulaski. KM 83, 85. In fitted case with Narodowy Bank Polskie Certificate of Authenticity. Brilliant Proof. 2 pieces. (Est. $750-$850)
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