Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4913 to the contrary, an employee whose date of birth was March 27, 1916, and who became a member of the Kansas public employees retirement system on September 1, 1966, and who was first employed by the same participating employer from August 1, 1938, through July 17, 1948, shall receive prior service credit for such employment prior to January 1, 1962. Prior service annual salary for any such member shall be $2,820. Any additional benefits accruing as a result of this section shall accrue from the first day of the month coinciding with or following the effective date of this act.