Andy,i'm 99.9% sure,a NOS set of Pro Racer and Freestlye bars i bought years ago both had this decal on them.I remember my brand new pro i bought bitd had a decal the same size as the "caution" decal but had the stars/hi-performance(top part of headtube) on it. This was placed where the NORA decal lives. Guess i must have bought this prior to 84. Perhaps give Mark j or Glen a nudge,see what they think.
All the best
Dave.