(1) Where, immediately before 1 July 1975, a pension was payable to a person:
(a) being a pension benefit that became payable to the person before 1 July 1974; or
(b) being a pension benefit that became payable, on or after 1 July 1974, to the person as a widow, or as an eligible child, by reason of the death of a member of the scheme who retired before 1 July 1974;
this section applies to the person .
(2) The increase provided for by section 19 in the annual amount of the pension benefit payable to a person to whom this section applies is the prescribed percentage of the annual amount of the pension benefit payable immediately before 1 July 1975 or, if the pension benefit is a child's pension, so much of the annual amount of that benefit so payable as is referred to as additional pension in whichever of subsections 42(2), 42(3), 43(2) and 43(3) of the Defence Force Retirement and Death Benefits Act is applicable .