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Centenary penny halfpenny single usage

Posted: Sat Feb 12, 2011 6:00 pm
by jimusedcontrols
I hope someone can help me here. I have the brown penny halfpenny 1940 Centenary stamp used on cover using the Services privileged rate. September 1940 went through ok but one from July 1940 attracted 2d postage due.
How long was the rate available and were there exact requirements which may not have been met? I was just rereading about Chris Harman's presentation in the newsletter 317.

regards
James