[veleno45]

A PSA graded Cobb card caught my eye today and I am hoping to get some info from some of the veterans here. The flip looks different then anything I have and was hoping that someone could post images of the different PSA flip versions that exist, and dates used if possible. I have a couple older ones where the back isn't listed on the flip, but this seems to be even older with different type. How many versions are there?