Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4911 and 74-4913 to the contrary, an employee who became a member of the Kansas public employees retirement system on August 1, 1966, who was first employed by a participating employer periodically from April 16, 1937, until April 14, 1961, and who was employed periodically by said participating employer from January 9, 1962, until April 23, 1965, and who is employed by a participating employer on the effective date of this act, shall upon the payment of appropriate employer and employee contributions, be entitled to receive participating service credit for employment with his participating employer for the period January 9, 1962, until April 23, 1965. Said employee shall also be granted prior service credit with all participating employers for all service prior to January 1, 1962. The prior service benefit shall be computed by using a prior service annual salary of one thousand one hundred seventy-six dollars ($1,176).