What was the very first toy sold in a happy meal?

The very first Happy Meal in 1979 in Kansas City was the Circus Wagon Happy Meal and McDonaldland Fun-To-Go in St. Louis. It cost one dollar and contained either a McDoodler stencil, a puzzle book, a McWrist wallet, an ID bracelet or McDonaldland character erasers.[4] The Circus Wagon Happy Meal consisted of a hamburger or cheeseburger, twelve-ounce soft drink, a small order of french fries, and a "McDonaldland Cookie Sampler", a small portion of cookies.