Dixon Viva-Tone Colored Pencils
Viva-Tone are a student grade colored pencil that was a direct competitor of Venus Laurentien and Eagle Canadiana sets. The name "Viva-Tone" was used in Canada since as early as 1950 according to the Canadian trademark registration. The most recent Viva-Tone advertisement that I've seen is from the mid-1980s but they may have been produced into the early 1990s.