1934 Chicago World's Fair Souvenir Lapel Pin

Lapel Pin from the 1934 Chicago World's Fair, "A Century of Progress". Pin is about 3/4 inch long. The color in the photo looks kind of gold due to the lighting, but it is actually a silver color. Very good condition. Pin on back is in good working order. On the back it says: "J.D. Pollack Co. Chicago" or perhaps J.O. Pollack, it is hard to tell.