NETHERLANDS EAST INDIES postage due on 1937 air cover Maastricht

NETHERLANDS EAST INDIES postage due on 1937 air cover Maastricht. This was the first flight that no air surcharge and air label was required but the 6ct paid was not vobering the simple 12,5ct rate

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NEDERLAND brief 1937 Maastricht per eerste vlucht per DC3 Specht dat luchtrecht en etiket was vervallen. Maar minimum tarief was 12,5 ct en derhalve beport