This is a circular promotional pinback button produced for Phillips 66. The button is constructed from lithographed tin-plated steel and features a split-color design. The upper yellow portion depicts a stylized black singing bird mascot, a recognizable figure from Phillips 66 advertising campaigns of the 1930s and 1940s, shown with three musical notes. Beside the bird, cursive text reads Time to Change to. The lower black section features the Phillips 66 shield logo with the brand name in the upper section and the number 66 in the lower section. To the right of the logo, the words SUMMER OILS appear in large, yellow block lettering. The reverse side of the button is composed of an unpainted metal back with a horizontal wire pin and clasp. Diameter: 1.25 to 1.75 inches (estimated).