Ah, no. Many good bike shops stocked clincher rims in 700. Everyone I rode with built a pair to ride during the week, saving their sewups for the "real" rides. (We were college students: didn't have cars, rode only our bikes)

Back in those days I was using a Schwinn tire that was not especially light, but was a V shape, quite a pointy tread so the contact area was smaller than normal. Can't remember what they were called, but my circle considered it the best for the time.

I'm not sure the International was considered a touring bike, just less costly than the Pro. People raced them too, like PX10s. They're actually pretty sweet riding bikes, with all the Carlton influence. I've had a number of them over the years.