(1) Every individual who will have completed ten years of service at the time of his retirement or death, but does not meet the qualifications for an annuity amount determined under the provisions of section
231b (h)(1) or
231b (h)(2) of this title, shall, at the time his annuity under section
231a (a)(1) of this title begins to accrue, be entitled to a lump sum in the amount provided under subdivision (2) of this subsection. If an individual otherwise eligible for a lump sum under this section dies before he becomes entitled to an annuity under section
231a (a)(1) of this title, or before he receives payment of such lump sum, such lump sum shall be payable to the person, if any, who is determined by the Board to be such individuals widow or widower and who will not have died before receiving payment of such lump sum. If there be no such widow or widower, such lump sum shall be payable to the children, grandchildren, parents, brothers and sisters, or the estate of the deceased individual in the same manner as if such lump sum were a lump sum payable under subsection (c)(1) of this section.
(2) The lump sum provided under subdivision (1) of this subsection shall be in an amount equal to the sum of
(A) 1.5 per centum of so much of such individuals combined earnings for any calendar year after 1950 and before 1954 as is in excess of $3,600, plus
(B) 2 per centum of so much of such individuals combined earnings for any calendar year after 1953 and before 1957 as is in excess of $4,200, plus
(C) 2.25 per centum of so much of such individuals combined earnings for any calendar year after 1956 and before 1959 as is in excess of $4,200, plus
(D) 2.5 per centum of so much of such individuals combined earnings for the calendar year 1959 as is in excess of $4,800, plus
(E) 3 per centum of so much of such individuals combined earnings for each of the calendar years 1960 and 1961 as is in excess of $4,800, plus
(F) 3.125 per centum of so much of such individuals combined earnings for the calendar year 1962 as is in excess of $4,800, plus
(G) 3.625 per centum of so much of such individuals combined earnings for any calendar year after 1962 and before 1966 as is in excess of $5,400, plus
(H) 4.2 per centum of so much of such individuals combined earnings for the calendar year 1966 as is in excess of $6,600, plus
(I) 4.4 per centum of so much of such individuals combined earnings for the calendar year 1967 as is in excess of $6,600, plus
(J) 3.8 per centum of so much of such individuals combined earnings for the calendar year 1968 as is in excess of $7,800, plus
(K) 4.2 per centum of so much of such individuals combined earnings for each of the calendar years 1969 and 1970 as is in excess of $7,800, plus
(L) 4.6 per centum of so much of such individuals combined earnings for the calendar year 1971 as is in excess of $7,800, plus
(M) 4.6 per centum of so much of such individuals combined earnings for the calendar year 1972 as is in excess of $9,000, plus
(N) 4.85 per centum of so much of such individuals combined earnings for the calendar year 1973 as is in excess of $10,800, plus
(O) 4.95 per centum of so much of such individuals combined earnings for the calendar year 1974 as is in excess of $13,200. For purposes of this subsection, the term combined earnings shall include compensation as defined in section 1(h) of the Railroad Retirement Act of 1937 [
45 U.S.C.
228a (h)], wages as defined in section 209 of the Social Security Act [
42 U.S.C.
409], and self-employment income as defined in section 211(b) of the Social Security Act [
42 U.S.C.
411 (b)].