My first 10 speed was a white Sekine similar to Randy's red one posted above but with downtube shifters. That was about 1975. I believe it was the second from the bottom in the lineup that year.
Anyway, I rode that thing all over the place for a couple of years. Today, if it were tuned up, with new cables, tubes, tires, brakes, and had a full overhaul of all the bearings, it would do a RAGBRAI just fine. People do RAGBRAI on all sorts of bikes, from fixed gear bikes to high wheelers.