Light grey semi-gloss to a dark grey matte chalky version. Set #2075 with book was released 1974-1981. Model #375 without the book was available 1982-1987. Book “Brighty of the Grand Canyon”, by Marguerite Henry. See separate record for Chalky version.
In 1974, this model was released through Sears with the book, and in 1981 this set was released through JC Penney.