In 1943 the Algerian 5 centime red violet and the 1.75 franc henna brown definitives showing a view of Ghardaia were surcharged 30 frs and overprinted "E.F.M." (Emergency Field Message) to be used to pay cable tolls for American and Canadian military personnel.
(information lifted from this website:
http://www.groseducationalmedia.ca/vsc/algeria1.html
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this post www.pagowirense.nl/stamps/