1.75". Missing back pin. Likely produced by the Indianapolis Photo Button Mfg. Co., as that was the company which produced the 1.25" size variety. Scattered tan spotting on surface, w/a few scattered bumps seen in reflected light. Glossy. Fine. A total solar eclipse in May captivated the American public spawning button manufacturers to produce a number of designs for the presidential campaign, w/this design in the larger size being among the rarest.