What is "nikkorex"

The Nikon Nikkorex series were low-cost, fixed- lens, 35 mm film, single-lens reflex cameras produced by the Japanese optical manufacturer Nippon Kogaku K.K. (now Nikon Corporation). They were designed and marketed as low-cost, feature-reduced versions of Nikon's flagship F SLR. Whereas the F was aimed at professionals and serious amateurs, the Nikkorex series were designed to bring the advantages of through-the-lens viewing to consumers who were not interested in the flexibility (and cost) of the F system.