Originally Posted by
ramzilla
...I'd also be surprised if it was just an ordinary high tension steel frame....
Oh, it's definitely hi-tensile tubing. My wife has one, which I bought for her new in 1977. The tubing deal say HI-TENSION, the catalogue says "hi-tensile steel tubing" and the proper seat post size is 25.8mm. The Canadian market models were spec'd by the distributor (in this case Shields) and do not necessarily reflect what was being offered in the USA.