1.25" without backpaper or maker name. We've seen this design of a tiger driving an early race car but as an enamel lapel stud reading "Tacoma 1914 Auto Races." This is from a year earlier with the 1913 date on the car beneath the event name "Montamara Festo" with the dates below "July 2-3-4-5-6." A few typical oxidation spots on metal reverse but the cello remains Mint. Great design and a rare button.