Poland 1956 Postal Museum, specimen on ungummed card, imperf, backstamped 'WZOR,' mint. SG996

Poland 1956 Postal Museum, specimen on ungummed card, imperf, backstamped 'WZOR,' mint. SG996

POLA0996MP
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Poland 1956 Postal Museum, specimen on ungummed card, imperf, backstamped 'WZOR,' mint. SG996