It has some scratches and nicks.  It is a bit faded, but it is an original horn button for a 64 to 66 Chev pickup.  It will honk as well as a new one.   The upper diameter of the chrome portion is 2 ¾”; The lower portion of the chrome is 2 7/8” in diameter.  The chrome part is 7/8” high.  The rubber part that squeezes into the steering wheel horn bucket is 2 3/8” in diameter.