"Paper is a Munition of War"
During the Second World War, the Wartime Prices and Trade Board printed and distributed labels that allowed envelopes to be reused, as a way to save paper.
"Re-use this envelope ... Paper is a munition of war," Wartime Prices and Trade Board label, to Wallace Birdsill, Tillsonburg, Ontario, 16 May 1945
John Irvine Collection - London, Ontario
envelope, 9.4cm x 16.6cm