I got this bike, this week, a 60 cm (or 24 inch, as the Trek catalog refers to it) Trek 710, from 1981. It was updated, sometime in the 1990s, from the looks of it. The changes that have beed made are all the "upgrades" we did in the bike shop, for owners of older road bikes, back then.
Here it is just after I test-rode it, with the seat and bars set to my height (5'10"). Actually, now that I think about it, I had raised the seat, for this photo, because it looked stupid with the seat at my setting. About half of the fluted part of the post was inside the tube, when I rode it.
The mtb derailleurs allow the use of this:
flared SR World Ranonneur bar.
The frame was Proudly made in...
Unfortunately, the bike is just too big for me. Fortunately, Bill is looking for a Rando rig. So, this bike is heading to the Great Midwest, before long. I hope it gets a lot of happy miles (kilometers, I guess I guess, in a rando context) piled onto it!