2-1/8" with back paper that has large text giving address of Whitehead & Hoag Co. at their Indianapolis location. Paper has spot of surface text missing so the company name is only about 60% complete but the rest of the address remains. Button shows female figure holding staff that suspends masks of tragedy and comedy. To her left is a shield with the letters "IFA" to represent the name of the event. At the female's feet is the text "The Pride Of The State." Red color on right half was once more intense but still a very nice appearance and no other wear or damage. Rare.