Originally Posted by
dabac
It's a brand named "REX", and it's old enough to have 7-speed and still be mid-prized back in the day. You're unlikely ever to have seen one, it wasn't a big brand.
I've removed decals from several recent bikes and wheelsets without the first problem. I tried to remove them from Cheryl's old MTB and gave up. I didn't search as to why they wouldn't come off, just attributed it to age and fossilization.