component of the levy is reduced shall be equal to 40 % of the average of the variable components of the levies in force during the three months preceding the month in which the amount in question was fixed. The amount shall be fixed by the Commission not later than the 10th day of the month preceding the quarter during which the amount shall apply. "Quarter" shall mean a period of three months beginning on 1 February, 1 May, 1 August or 1 November in each year. However, should the entry into force of the Agreement not coincide with the beginning of one of these quarters, the first reduction in the levy shall be applicable for the month or months of the current quarter. 4. Proof that the special charge on exports has been collected shall be provided by the insertion by the customs authorities under "Remarks" on the movement certificate of one of the following endorsements: Taxe spéciale à l'exportation appliquée Saerlig udfoerselsafgift opkraevet Sonderausfuhrabgabe erhoben Special export charge collected Applicata tassa speciale all'esportazione Bijzondere uitvoerheffing voldaan Tasa especial a la exportación aplicada Aplicada taxa especial à exportação Eidikós fóros poy échei efarmostheí katá tin exagogí (signature and official stamp) I should be grateful if you would acknowledge this letter and confirm the agreement of your Government with its contents.' I have the honour to confirm that my Government is in agreement with the contents of your letter. Please accept, Sir, the assurance of my highest consideration. On behalf of the Government of the Argentine Republic 1.2.3 // COMMISSION OF THE EUROPEAN COMMUNITIES Directorate-General External Relations // // Brussels . . . . . . 1.2 // // // // H. E. Luis Ramiro Alfonsin Ambassador Mission of Argentina Avenue Louise 225 B-1050 Brussels Sir, I can inform you that the Community will take the necessary measures in order to open, for the period 1987/88, on an autonomous basis, a special Community import tariff quota at a duty of 20 % without levy for 1 000 metric tonnes of high-quality fresh, chilled beef falling within subheading 02.01 A II a) of the Common Customs Tariff, corresponding to the following specifications: 'Special or good-quality beef cuts obtained from exclusively pasture-grazed animals, aged between 22 and 24 months, having two permanent incisors and presenting a slaughter live weight not exceeding 460 kilograms, referred to as "special boxed beef", cuts of which may bear the letters "sc" (special cuts).' Detailed rules for the application of this measure shall be determined by the competent authorities. Yours faithfully,