TAG Heuer - Carrera Calibre 5 “Ring Master”. TAG Heuer unveiled a Special Edition of its Carrera Calibre 5 as a tribute to boxing legend Muhammad Ali. The new TAG Heuer Carrera Calibre 5 "Ring Master" Tribute to Muhammad Ali was inspired by the famous Heuer Ring-Master watch currently on display in the TAG Heuer museum. The new TAG Heuer Carrera Calibre 5 “Ring Master” Tribute to Muhammad Ali (Ref. WAR2A11.FC6337) has a price of US$ 3,000.