OK, here are pictures of my Kelseys, I bought them mid last year. I use them as show tires and for judging. You can see the stripe that runs from the bead out, the tire mounting goop ran over the sidewall as I drove out of the shop. The area is like a deep scar, where the smooth rubber has become rough, almost like it was sanded with a coarse substance, etched into the sidewall. You will also notice the seam or mold mark on the sidewall about an inch or two down from the tread, that also is unsightly. When I took them back to Discount tire, they said they had never seen that kind of etching, and indeed I have had them mount my Diamondback, and Coker reproduction Firestones and BFGs without any of this happening. Not sure what chemical they were using, but it etched your tires and no others. Thanks for listening.
I will forward these onto John Kelsey. You are correct that it looks like abrasive hit that tire. Is it one tire or all of them? Again, if you can, please give me a call. We will get to the bottom of this!!!!