When a national of one Contracting Party or a person described in paragraph 1(b) of Article 4 was, at the time of death, subject to the Maltese Social Security Act or in receipt of a benefit under this Act, and had previously completed a total insurance period of at least 12 months under the Netherlands' legislation on survivors' insurance, the survivor shall be entitled to a benefit determined in accordance with the latter legislation and calculated according to the provisions of Article 22.