§387-4  Wage discrimination prohibited.  No employer shall discriminate in any way in the payment of wages as between persons of different races or religions or as between the sexes; provided that nothing herein shall prohibit a variation of rates of pay for employees engaged in the same classification of work based upon a difference in seniority, length of service, substantial difference in duties or services performed, difference in the shift or time of day worked, or hours of work; and provided that an employer who is paying a wage rate differential in violation of this section shall not, in order to comply with this section, reduce the wage rate of any employee. [L 1959, c 122, §2; Supp, §94-4.5; HRS §387-4; am L 1972, c 63, §1]