General Post Office poster reminding the public of the minimum postage rate of 4 pence for foreign letters (c. 1950). The Commonwealth rate of 2 pence applies to the British Commonwealth and certain other countries. Artwork by Kenneth Bromfield.

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General Post Office poster reminding the public of the minimum postage rate of 4 pence for foreign letters (c. 1950). The Commonwealth rate of 2 pence applies to the British Commonwealth and certain other countries. Artwork by Kenneth Bromfield.
Gossip of the Field
[ ... ]
English postcard manufacturers have managed to have the proposed halfpenny--one cent--war tax cancelled and Canadian wholesale dealers are fighting for a similar provision.
No British postcards showing pictures of warships are allowed by the government.
[ ... ]
-- Geyer's Stationer, November 24, 1915, p. 23 (last accessed on April 16, 2014 at books.google.com).