McKee/Glasbake of Pittsburgh made this heat resistant mold out of thick, pressed glass.This vintage beauty has many uses. Bake quick breads and meatloaf or freeze tortes or chill and serve Jell-o. It could make flavored ice rings for punch.There are three resting pads on the bottom. It has an art deco style with ribbed sides. Glasbak was way ahead of Pyrex!  Measures 9" wide X 3" deep X 3.5" center spot. US Patent D133,413 Other patent pending