Question about old crayons

Hi, I recently found a mint condition (Completely unused) discontinued green-blue Crayola crayon, so I decided to look it up just to see if it was worth anything/when it was discontinued, etc. But when I was looking at other pictures of the color, and noticed the it was mainly written as 'Green blue', instead of 'green-blue'. Does anyone know if/when Crayola changed the writing on the crayon? And any estimate over how old this may be?