[quitcrab]

You referred to them as an insert set. They are not inserts. They sold in one cent (one card) and five cent wax packs I think. So any thing in a one cent wax pack will have a stain on the back and the bottom card of a 5 cent wax pack
I think psa should not label cards as ST because that’s the way they came out if the pack if that makes sense. I truely don’t mind a little dark brown stain on the back because the fronts are beautiful.. if grading I think you’re better off getting the higher number grade with the stain qualifier…. Just my opinion