1940 Catalog, page 16: "NO. 6l8 AUTO FORM TRUCK
Recommended for children two and
three years of age.
This attractive toy truck can be used first of all to train the child in the selection of simple shapes. Placing the round pieces on one peg and the square pieces on another, the child is learning to think for himself. As the child progresses with his play with blocks he will then use the Auto Form Truck to carry block shapes from one project to another.
Price $1.75"