Check out this Vintage Centurion Dave Scott IRONMAN 12 speed Road Bicycle. From my Research, it’s from 1985 and it was the Top of the Line Dave Scott with Shimano 600 Components. This Centurion Bicycle was the Predecessor to the Centurion TA Comp and is made of Japanese Steel featuring Cro-Mo Seamless Tubing ( Tange Champion #1 ) Double Butted Tubes