Claim: London Customs Convention, officially titled the Netherlands–Belgium–Luxembourg Customs Convention, is a treaty that was signed on September 5, 1944 at London which was ratified in The Hague in 1947, but was made effective in 1948.
Evidence: Officially titled the Netherlands–Belgium–Luxembourg Customs Convention, the London Customs Convention was the treaty that established the Benelux Customs Union on 5 September 1944. London, United Kingdom 1948 Ratified in The Hague in 1947, the London Customs Convention came into force in 1948 and lasted until 1960 when it was superseded by the stronger Benelux Economic Union, signed in The Hague in 1958.