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| Entry into force: | 25 September 1928. |
| Registration: | 25 September 1928, No. 18451. |
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| Argentina | (Apr 18th, 1946) |
| British Empire | (Feb 17th, 1926) |
| (Same reservation as for the Convention.) | |
| State of Sarawak | (Mar 11th, 1926 a) |
| Bahamas | (Oct 22nd, 1926 a) |
| Burma2 | |
| Canada | (Jun 27th, 1928) |
| Australia | (Feb 17th, 1926) |
| New Zealand | (Feb 17th, 1926) |
| Union of South Africa | (Feb 17th, 1926) |
| India | (Feb 17th, 1926) |
| Iraq | (Aug 8th, 1931 a) |
| Bolivia | (Apr 15th, 1932 a) |
| Bulgaria | (Mar 9th, 1927) |
| Chile | (Apr 11th, 1933) |
| Colombia | (Dec 3rd, 1930 a) |
| Costa Rica | (Jan 8th, 1935 a) |
| Cuba | (Jul 6th, 1931) |
| Czechoslovakia3 | (Apr 11th, 1927) |
| Ecuador | (Oct 23rd, 1934 a) |
| Egypt | (Mar 16th, 1926 a) |
| Estonia | (Aug 30th, 1930 a) |
| Finland | (Dec 5th, 1927 a) |
| Germany | (Aug 15th, 1929) |
| Greece | (Dec 10th, 1929) |
| Haiti | (Nov 30th, 1938 a) |
| Honduras | (Sep 21st, 1934 a) |
| Japan | (Oct 10th, 1928) |
| Latvia | (Oct 31st, 1928) |
| Luxembourg | (Mar 27th, 1928) |
| Netherlands | (Jun 4th, 1928) |
| (including Netherlands Indies, Surinam and Curaçao) | |
| Portugal | (Sep 13th, 1926) |
| Romania | (May 18th, 1928 a) |
| Salvador | (Dec 2nd, 1926 a) |
| Spain | (Apr 19th, 1930 a)Sudan (Feb 20th, 1926) |
| Thailand | (Oct 11th, 1929) |
| Turkey | (Apr 3rd, 1933 a) |
| Venezuela | (Jun 19th, 1929 a) |
| Yugoslavia | (Sep 4th, 1929) |
Albania | Iran | Nicaragua | |
| Participant | Succession (d) |
| Bahamas | 13 Aug 1975 d |
| Czech Republic3 | 30 Dec 1993 d |
| Fiji | 1 Nov 1971 d |
| Papua New Guinea | 28 Oct 1980 d |
| Slovakia3 | 28 May 1993 d |
| Tonga | 5 Sep 1973 d |
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1. See League of Nations, Treaty Series, vol. 81, p. 317.
2. See note 3 in part II.2 in the League of Nations Treaties.
3. See note 11 in chapter I.2.
4. The Swiss Federal Political Department, by a letter dated July 15th, 1936, informed the Secretariat of the following:
"Under the terms of the arrangements concluded between the Government of the Principality of Liechtenstein and the Swiss Gov ernment in 1929 and 1935, in application of the Customs Union Treaty concluded between these two countries on March 29th, 1923, the Swiss legislation on narcotic drugs, including all the measures taken by the Federal authorities to give effect to the different international Conventions on dangerous drugs, will be applicable to the territory of the Principality in the same way as to the territory of the Confederation, as long as the said Treaty remains in force. The Principality of Liechtenstein will accordingly participate, so long as the said Treaty remains in force, in the international Conventions which have been or may hereafter be concluded in the matter of narcotic drugs, it being neither necessary nor advisable for that country to accede to them separately."
5. In a notification received on 21 February 1974, the Government of the German Democratic Republic stated that the German Democratic Republic had declared the reapplication of the Convention as from 7 April 1958.
In this connection, the Secretary-General received on 16 March 1976 the following communication from the Government of the Federal Republic of Germany:
With reference to the communication by the German Democratic Republic of 31 January 1974, concerning the application as from 7 April 1958, of the International Opium Convention of 19 February 1925, the Government of the Federal Republic of Germany declares that in the relations between the Federal Republic of Germany and the German Democratic Republic this declaration has no retroactive effect beyond 21 June 1973.
Subsequently, in a communication received on 17 June 1976, the Government of the German Democratic Republic declared:
"The Government of the German Democratic Republic takes the view that in accordance with the applicable rules of international law and the international practice of States the regulations on the reapplication of agreements concluded under international law are an internal affair of the successor State concerned. Accordingly, the German Democratic Republic was entitled to determine the date of reapplication of the International Opium Convention, February 19th 1925 to which it established its status as a party by way of succession."
See also note 14 in chapter I.2.