These forums are a great help. Like Yogi Berra said, "You can observe a lot by just looking.."I missed the tiny stamped 1980 on the head badge. The badge was glued not riveted but the badge has holes for the rivets. I also took a magnifying glass to the front and rear dropouts. They are very beat. It looks like they were nutted at on time, not QRs. Hard to see but I spotted the remnants of "Tange TR" both front and rear.
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Fred, for R Community Bikes. www.rcommunitybikes.org
2,500 (yes 2,500) bikes given EACH YEAR to the needy 2011- 2018. All volunteer.