An employment card issued in accordance with the byelaws with respect to the employment of children made by the North Eastern Education and Library Board on 6th November 1973, the South Eastern Education and Library Board on 7th February 1974, the Belfast Education and Library Board on 25th February 1974, the Southern Education and Library Board on 19th September 1974 or the Western Education and Library Board on 15th January 1975 shall be deemed to be a card issued under regulation 6(4).