Offered here is a RARE seldom seen. (only used to the media #449). Great RARE boxing collectable on Cassius Clay / Muhammad Ali. Only issued to the press in the Press Media Kits.Probably 500 were made, we have never seen a media # higher than #449. The item "VERY RARE 1978 World Championship Muhammad Ali vs Spinks boxing pinback button" is in sale since Sunday, January 20, 2013. This item is in the category "Sports Mem, Cards & Fan Shop\Fan Apparel & Souvenirs\Boxing". The seller is "championsofthering" and is located in Casselberry, Florida. This item can be shipped worldwide.