Paging Ben North, paging Ben North...
 

These are among my favorite freak cards but I am 99.8% sure they are just sun faded. Apparently they were haphazardly stacked in a pile with the slivers of the cards not covered by other cards in direct sunlight, and they were exposed for quite a while. I know that this has been discussed here before as to why the cards would have patterns of fading on them. It looks like the black ink was impervious to the fading.

Those are great. If you look at the black areas close they are also faded. Scan a small area of the black right at the faded line in high resolution. Then blow that pic upon your laptop or even better put it on you TV screen. Then the fading in the black is incredibly noticeable.

All of the black ink on the Gross scan was exposed to the sunlight, on the Turner card scan his first name was not exposed to the sunlight and his last name was.

On the Wayne Gross card you can see the very corner of the trophy wasn't exposed and it is a nice dark shiny black. The black on the rest of the cup is a duller slightly greyish black.

It's not really noticeable unless you are looking for it.

It is cool to see the changes on the 78 Topps cards. Each year fades a little different.