I just sold my 1983 Trek 620. I'd been touring on it quite a bit lately, all in-state tours of less than 500 miles. It came equipped with a Helicomatic rear hub, and I just didn't like it very much so I upgraded the wheels. Then I salvaged some 8 speed brifters and that led to salvaged newer derailleurs. So it slowly modernized.
I sold it to a guy going touring in Cuba who planned on leaving the bike there as a donation. I thought that was cool.