2.25" with curl reading "Mini Media." Button pictures a nuclear explosion with the red hands of the clock set in the position as specified by the text on the button. The button was issued in 1984 in opposition to the escalating arms race between the U.S. & U.S.S.R. The concept relates to a Doomsday Clock which is a concept begun in 1947 by the Board of Directors of Bulletin of Atomic Scientists at the University of Chicago. Over the years, as world events changed, the number of minutes before "midnight" varies but it has rarely been closer than that depicted on this button. NM displaying Mint.