I bought this bike new in the mid-80s, don't remember when exactly, but your post helped me. At first I rode it a bunch and even raced it, but then it just sat around as I moved several times and ran instead. I had to quit running 6 mos ago (knee injury from playing college football) and started riding it on 10 or 15 mi jaunts 5 to 7 days a week. I wouldn't trade it straight up for a new mountain bike. Attached is a file with decode info and a picture of it. All I've done to it is switch out to a new seat, add a water bottle bracket, add new tires, add a tire pump and turned the shifting and braking systems - otherwise it's totally original except for scratches. Thanks for the info in this thread!