Upon the death of any person after retirement and while receiving a retirement allowance from this system, or any superseded system, there shall be paid to his estate or to such beneficiary as he shall nominate by written designation duly executed and filed with the board, the sum of seven hundred fifty dollars ($750) to be provided from contributions of the county or district.
This section applies to every member who dies after this section becomes operative whether he has retired before or after the operative date or effective date of this section.
This section shall not be operative in any county until such time as the board of supervisors shall, by resolution adopted by majority vote, make the provisions of this section applicable in such county.