From April 2018 edition of Britain's Stamp Magazine. The campaign against pen-cancels is under way.
See this page for examples of pen-cancelled packets and letters.
Wambrook climax rubber cancels, 1911 & 1922
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Wambrook had three different climax rubber cancels; below are examples of
the first (from 1911) and the third (from 1922). A second cancel is known
used...
