Notwithstanding the provisions of Kan. Stat. Ann. §§ 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 public employees retirement system on March 1, 1971, was first employed by said participating employer from May 15, 1937 to February 5, 1938, and was reemployed from June 1, 1938 to August 20, 1938, and from November 16, 1938 to October 8, 1951, and again employed February 16, 1970, shall upon retirement be granted prior service credit for employment with said participating employer prior to entry date whether such employment was continuous or not. A prior service benefit shall be computed by using a prior service annual salary of four thousand one hundred dollars ($4,100).