Vintage Bri-Tone No 6 crayons 1950's?

The diamond wrapper was used by Bri-Tone. The "No. 6" refers to the number of crayons in the box. This box is the original package with original crayons. One crayon is missing. The colors of the box are still vibrant. Crayons don't look used. Small little bit of nostalgia - great addition to vintage school display/crayon collector! Thinking 1950s era?