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>> THE POLISH POST IN THE FREE CITY OF GDAŃSK 1920 - 1939
>> POCZTA POLSKA W WOLNYM MIEŚCIE GDAŃSKU 1920 - 1939

>> 3 THE HARBOUR POST OFFICE
>> 3.1 THE EXCHANGE OF MAIL WITH OVERSEAS COUNTRIES

Left: Labels used in the Swedish exchange post offices in Stockholm and Malm and in the Norwegian exchange Post Office in Oslo for sending mailbags and parcels to the Polish Harbour Post Office in Gdańsk.
Right: Mailbag label for a mailbag cent from Post Office Warszawa 2 on 3 May 1932 to the main Polish Post Office Gdańsk 1 and from there on 6 May to the Harbour Post Office Gdańsk 3, containingmail for overseas destinations. POLSKI URZĄD POCZT. — TEL GDAŃSK 1 cds 6.05.31 and a WARSZAWA 2s cds 3.5.31 and a single-line Gdańsk 1 handstamp on the reverse.

The Polish Post in the Free City of Gdańsk 1920 - 1939, Page 17.