A footnote: I have this same bike, all original in very good condition, Shimano 333, Thunderbird deraill, stem shifters and Dura-Ace brakes. Extremely smooth rider, but design belongs in the sport bike category, neither a genuine tourer nor a racer, imo. It's my commuter. Although it's thin tubing and nice lug work, I suspect it's 1020 hi ten tubing, ..it's darn weighty compared to my 80's Miyatas. Toptube and downtube decals say " Miyata Racer", with the classic gold and black metal Miyata headbadge, (cool silver and black royal crown Miyata decal on downtube).