(a) The benefits which can be claimed by a national for old age or death under the social security legislation of any of the Contracting Parties shall, in principle, be determined on the basis of the total of the benefits to which he would be entitled if the aggregate of all the periods of insurance reckoned in accordance with the provisions of Article 2 had been completed in accordance with the social security legislation of each Contracting Party under which that national had been insured.
(b) Each Contracting Party shall decide in accordance with its own social security legislation, whether that national, taking into account all his periods of insurance irrespective of the territory in which those periods have been completed, satisfies the conditions laid down in that legislation necessary to give him a right to the benefits provided thereunder.
(c) Each Contracting Party shall calculate the amount of the cash benefit to which that national would have been entitled if all his periods of insurance had been completed exclusively under its own social security legislation, and shall determine the benefit actually due to him from it by reducing that amount in proportion to the length of the period in fact completed under its own social security legislation.
(d) If that national, taking into account all his periods of insurance referred to in Article 2, does not simultaneously satisfy the conditions laid down by the social security legislation of all the Contracting Parties concerned, his right to the benefits under the social security legislation of each such Contracting Party shall accrue as soon as he satisfies the conditions laid down by the social security legislation of that Contracting Party.
(e) For the purposes of this Article, the expression “ benefits which can be claimed for death ” shall mean the pensions, allowances or grants awarded to survivors on a basis comparable to that governing old age insurance under the social security legislation of each Contracting Party, but shall not include benefits which are granted irrespective of the duration of insurance or the number of contributions paid.