Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4913 to the contrary, an employee of a participating employer who became a member of the Kansas public employees retirement system on January 1, 1962, who was first employed by a participating employer on September 1, 1933, until April 30, 1934, who was again employed by another participating employer from August 1, 1935, until January 15, 1939, who was employed by another participating employer on January 16, 1939, to December 31, 1942, who was reemployed by said participating employer in July, 1945, through October 15, 1947, and was reemployed October 19, 1961, shall upon retirement be granted service credit for all service with said participating employer prior to January 1, 1962. A prior service benefit shall be computed by using a prior service annual salary of three thousand three hundred sixty dollars ($3,360).