134.3.From 1 January 1984 and notwithstanding sections 134 and 134.1, where the surviving spouse, 65 years of age or over, of a contributor first becomes entitled to a surviving spouse’s pension provided for in this Act or to a retirement pension payable under this Act or under a similar plan, having become entitled to the other such pension, the surviving spouse’s pension payable to the surviving spouse thereafter is a basic monthly amount equal to the lesser of the two following amounts:
(a) the greater of the amounts calculated in accordance with paragraph a of section 134.2, and
(b) the difference between
i. 1/12 of 25% of the average of the Maximum Pensionable Earnings for the year in which the surviving spouse first became entitled to the surviving spouse’s pension provided for in this Act or to a retirement plan payable under this Act or under a similar plan, having become entitled to the other such pension, and for each of the two preceding years, and
ii. the amount of the retirement pension of the surviving spouse.