Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4913 to the contrary, an employee of a participating employer having been reemployed on April 1, 1965, and becoming a member of the Kansas public employees retirement system on April 1, 1966, who was previously employed by said participating employer from July 1, 1933, through December 31, 1934, was reemployed on January 1, 1935, through June 20, 1937, from September 1, 1937, through December 31, 1937, from October 1, 1955, through April 1, 1957, shall upon retirement be granted prior service credit for all service with said employer prior to January 1, 1962. The prior service benefit shall be computed by using a prior service annual salary of four thousand seven hundred and forty dollars ($4,740).