Rebadged as "Safety Mileage" for the rear, but looks very familiar to me
I tried one of those on a Trident years ago. The best I can say is that it didn't inspire confident handling, I got the bent pinkie on my right hand to prove it.
As for the wear, you haven’t locked the back wheel under breaking at any point have you?
It is possible that it happened when I lost the rear axle nut a couple of years ago, but I was only doing about 35mph at the time. I only noticed the bald patch a couple of weeks ago.
In any case, my new K81 arrived today. They're made in Indonesia now, just down the road from the rubber plantation. I hope they're as good as they were when they were about the only option for these bikes.
I do kinda wonder how much use the balance dot on the tire is when there are wheel locks involved.