I can give you the date of manufacture of your Kynoch ammo if you give the stamped code on the box and if Imperial Chemical Industries (ICI) or Imperial Metal Industries (IMI) is printed on the back of the packet. Kynoch repeated their date coding after 1952 so need to know the place of manufacture. Often Kynoch indicated on the box if primers were corrosive or non-corrosive but knowing the date will also indicate if likely to be non-corrosive priming.