For your consideration, here is a Central Valley Marching Band Review Pinback Button Pin, Roosevelt Rough Rider Marching Band and Color Guard.  It has some wear and light spots on it.  There is some light corrosion on the back of it.  The button has a diameter of 2 1/4 inches.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (545.904n-.4px1)