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The mailer of this cover used a predecimal 3d Wilding
definitive. The date of May 31, 1974 can be read on the cancel
of the postage due labels, and it is more than two years after
predecimal stamps were declared invalid for postage. Therefore,
the word “invalid” was written near the stamps and the
information block shows 6p postage due, twice
the second class rate of 3p. (Postage due mail was charged twice
the due amount, a practice that dated back to the nineteenth
century.)
The recipient paid the 6p as indicated by the postage due stamps.
The mailer either didn't realize that this stamp was denominated
in the old currency or else thought the British Post Office would not notice
the difference.
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