784-785 ND "PRÓBA" MNH**

6th Polish Philatelic Exhibition in Poznan. Set of reprints. Signed. MNH**

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6th Polish Philatelic Exhibition in Poznan. Full set of reprints with "PRÓBA" overprint. Mint condition, never hinged. Signed by PZF expert, Zbigniew Korszeń. Very rare, only 220 sets printed.