These little lenticular cards pre-dated Sportflics which came later around 1985-1986 but featured similar “3-D” technology. They were ahead of their time - and came out of Kellogg’s cereal boxes - back when boxes of cereal had prizes for kids! Hard, but not impossible, to gem given the fact that we’re rolling around in cereal!
New ones have arrived. Going to get the 1979 graded, just to experience the process. I think it’s possibly a 5/6, wouldn’t be surprised if it comes back a 4.