In this note drawn up for the Belgian Commission for the Study of Post-war Problems (CEPAG), Fernand Van Langenhove, Secretary-General of the Belgian Foreign Ministry, analyses the conditions required for the conclusion and the operation of a Netherlands–Belgium Customs Union.

On 21 October 1943, Belgium, Luxembourg and the Netherlands sign a monetary convention in London which sets the exchange rate between the Belgian and Luxembourg franc and the Dutch guilder and establishes a mutual funding mechanism in the event of a balance of payments deficit of one of the signatories.

On 2 November 1943, the Belgian Foreign Ministry distributes this circular which refers to the address given by Camille Gutt, Belgian Finance Minister, at the signing of the Monetary Convention between Belgium, Luxembourg and the Netherlands on 21 October 1943, in London.

On 9 September 1944, Paul-Henri Spaak, Belgian Foreign Minister, officially informs Belgian diplomats of the conclusion of a transitional agreement on a customs union between the Governments of Belgium, Luxembourg and the Netherlands.

On 5 September 1944, Belgium, Luxembourg and the Netherlands sign a Customs Convention which, together with an additional Protocol of 14 March 1947, enters into force on 1 January 1948.

On 17 and 18 April 1946, representatives of the Belgian, Luxembourg and Dutch Governments meet in The Hague to discuss the economic relations between their three countries.

On 14 March 1947, Belgium, Luxembourg and the Netherlands sign an additional Protocol to the Benelux Customs Convention, which enters into force on 1 January 1948.

Text of the Belgium–Luxembourg–Netherlands Customs Convention, signed in London on 5 September 1944, specified and interpreted in accordance with the Protocol signed in The Hague on 14 March 1947.

On 2 and 3 May 1947, representatives of the Belgian, Luxembourg and Dutch Governments meet in Brussels to discuss the economic relations between the three countries.

In a report presented to the Franco–Belgian section of the Inter-Parliamentary Union on 1 November 1947, the Belgian MP, Raymond Scheyven, calls for a customs and economic union between France and Benelux.

From 29 to 31 January 1948, representatives of the Belgian, Luxembourg and Dutch Governments meet in Luxembourg to coordinate their financial, economic and social policies.

"Unter dem Zeichen des Benelux". Am 23. März 1948 illustriert der Karikaturist Simon in der luxemburgischen Tageszeitung Tageblatt das Inkrafttreten der Benelux-Zollunion.

From 10 to 13 March 1949, representatives of the Belgian, Luxembourg and Dutch Governments meet in The Hague to discuss the introduction of an economic union between the three countries.

On 16 October 1949, Belgium, Luxembourg and the Netherlands sign the Benelux Pre-Union Treaty in Luxembourg.

On 16 October 1949, Belgium, Luxembourg and the Netherlands sign the Benelux Pre-Union Treaty in Luxembourg. The Luxembourg delegation during the talks on the Benelux Pre-Union Treaty. From left to right: Aloyse Hentgen, Minister for Agriculture and Economic Affairs, Pierre Dupong, Minister of State and President of the Luxembourg Government, and Eugène Auguste Collart, Luxembourg Special Envoy to the Netherlands.

‘Pre-union. Do you love me? No!’ On 30 October 1949, the Brussels newspaper Le Phare Dimanche portrays the tensions within the Benelux Customs Union which are dividing Belgium and the Netherlands and are based on the pre-union agreement signed two weeks earlier in order to prepare for the Benelux Economic Union.

In his memoirs, Joseph Luns, Dutch Foreign Minister from 1956 to 1971, recalls the early days of economic cooperation between the Netherlands, Belgium and Luxembourg, which eventually led to the creation of Benelux.

Stamp issued in 1969 by the Luxembourg Post Office to mark the 25th anniversary of the Benelux Customs Convention.

Stamp issued in 1972 by the Luxembourg Post Office on the 50th anniversary of the Belgium–Luxembourg Economic Union (BLEU).

‘How the Dutch see Benelux.’ On 29 May 1949, the cartoonist of the Brussels weekly newspaper Le Phare Dimanche deprecates the view held by the Netherlands of its role within Benelux.

From 11 to 20 December 1949, on the invitation of the three Benelux countries, Italian journalists set out on a voyage of discovery through Luxembourg, Belgium and the Netherlands. On 12 December, Pierre Frieden, Luxembourg Education Minister, presents the main elements of the Benelux idea to his guests.

On 7 February 1951, the Netherlands journal Internationale Spectator publishes an article by Johannes Linthorst Homan, member of the European Movement, in which he analyses the situation of agriculture in the Benelux countries and speculates on possible European cooperation in agriculture.

On 14 October 1952, representatives of the Governments of Belgium, Luxembourg and the Netherlands, meeting in Knokke, adopt a joint declaration on the development of the pre-union and the achievement of economic union between the three countries.

Am 4. September 1954 zieht der belgische Außenminister Paul-Henri Spaak eine Bilanz der ersten zehn Jahre der Zollunion zwischen Belgien, Luxemburg und den Niederlanden. Er unterstreicht die Tatsache, dass es sich dabei nur um eine Zwischenetappe auf dem Weg zum vereinten Europa handelt.

On 3 February 1958, the Treaty instituting the Benelux Economic Union is signed in The Hague. There, Joseph Bech, Luxembourg Foreign Minister, pays tribute to those who took the initiative for this union before the end of the war.

In diesem Interview spricht Leo Tindemans, ehemaliger Attaché der Wirtschaftsabteilung des belgischen Landwirtschaftsministeriums, über die Kernpunkte in der Diskussion um landwirtschaftliche Fragen, die in der Nachkriegszeit zwischen den drei Beneluxstaaten stattgefunden hat.

In diesem Interview spricht Charles Rutten, ehemaliger Beamter im niederländischen Außenministerium, über die Einrichtung und die Ziele des politischen Konsultationsausschusses des Benelux (Cocopo) Anfang der fünfziger Jahre.

In this interview, Edmund Wellenstein, official in the Private Office of the Queen of the Netherlands from 1947 to 1950 then Head of the ‘Germany’ Division and Director-General for European Affairs in the Netherlands Ministry of Foreign Affairs between 1950 and 1952, describes the importance of the cooperation between the Benelux countries for the Netherlands after the Second World War, explaining how it served as a model for the beginnings of the European integration process.

Am 23. Dezember 1947 schildert die Luxemburger Tageszeitung Luxemburger Wort die Erfahrungen der Benelux-Länder als Beispiel dafür, wie die Kluft zwischen den Nationen in Europa überwunden werden kann.

In 1948, in the journal Études économiques, A. van Kleffens, Director of Foreign Economic Affairs at the Netherlands Ministry of Economic Affairs, sets out his country’s point of view on the Benelux customs union.

In 1948, in the journal Études économiques, W. Dierckx, Deputy Director at the Federation of Belgian Industry (FIB), draws up an initial report on the Benelux experience.

Am 1. Januar 1948 tritt die Zollunion zwischen Belgien, den Niederlanden und Luxemburg (Benelux-Länder) in Kraft. Die Luxemburger Tageszeitung kommentiert dieses Ereignis.