1.25" with a few tan age dots on St. Louis Button Co. paper and a few tiny age dots on back around the collet. From the front, only three tiny pinpoint age dots are detectable on close inspection. Glossy and VF. Building structure names "General Motors" with left and right panels each having a "Chevrolet" logo. Full text: "I Am Going/Biggest Building At The World's Fair/Including Chevrolet Assemble Plant". Rare and only two known to us. See two NYWF Ford anniversary day buttons #750.