Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4911 and 74-4913 to the contrary, any employee of a participating employer with an entry date of January 1, 1962, who became a member of the Kansas employees retirement system on July 1, 1966, who was first employed by said employer on July 1, 1965, and who was first employed by another participating employer from September, 1940, until June, 1943, and was employed by another participating employer from July 1, 1943, to June 30, 1965, shall be granted prior service credit with any participating employer prior to January 1, 1962. The prior service benefit shall be computed by using a prior service annual salary of six thousand three hundred forty-nine dollars ($6,349).