Shimano Dura Ace 25th Anniversary component group, limited and numbered edition Aluminium case All the component are new and unused The "Dura Ace" called top-of-the-range group from Shimano, Japan, was introduced in 1973. In 1998 Shimano released a limited and numbered series of the 25th anniversary group. All of the 25th Anniversary Dura-Ace components show the special 25th Anniversary golden logo. Component surfaces have been hand polished to a mirror like finish and more titanium hardware is used throughout the group. The case is complete but lack the automatic watch which has been stolen during an exhibition