NATO poster for European Cooperation by Leonard Roy Horton and Ronald Sendiford, Gt. Britain, 5th Prize in poster design competition to sell the Marshall plan.
Image: Key and a ring. On the insert of the key flags of countries participating in the Marshall Plan are depicted. On the key a relief of two ears of corn (symbol for peace)

ERP You hold the key.
Leonard Roy Horton and Ronald Sendiford - Gt. Britain - 5th Prize. Litography by Mouton Cy. The Hague

• Wikipedia > Marshall_Plan
• Vintagepostersnyc.com > ERP