An amendment either heretofore or hereafter made to this chapter, unless expressly stated otherwise, does not grant, take away, or otherwise affect the right to, or the amount of, any retirement allowance, or other benefit, of:
(a) Any member who has retired or shall retire prior to the effective date of such amendment.
(b) The spouse, children, beneficiary or coannuitant of any member if such member has retired or shall retire prior to the effective date of such amendment.
(c) The spouse, children, beneficiary or coannuitant of any member, if such member has died or shall die, prior to retirement and prior to the effective date of such amendment.
(Added by Stats. 1959, Ch. 1184.)