Presented here is the original extension letter agreement between Bob Arum of Top Rank (promoter) and Muhammad Ali for a bout following the Earnie Shavers fight in September, 1977. This agreement changed some provisions of their prior agreement in terms of money. Boldly signed in ink by Muhammad Ali, his manager Herbert Muhammad and Hall Of Fame promoter Bob Arum. This is a one page, typed agreement. Not creased or torn. Bold ink signatures of all three. Pencil notation at upper right corner, otherwise clean. Compression in upper right corner. Minor edge wear. 8.5" x 11." Rare, vintage signatures of all three men.