Originally Posted by bikingshearer

In the late 1960s, racing bikes were, generally speaking, still sporting longer wheelbases and longer seat stays than either the OP's or yours. Over the next few years, wheelbases and seat stays shrank until, by the mid-1070s or so, most racing frames were sporting the shorter dimensions. The quality of road surfaces had something to do with it, and at least in the US, the relative popularity of criterium racing helped drive the trend. The former made giving up a bit of stability and compliance for a bit more snappy handling viable. The latter made it downright desirable, at least stateside. The fact that the pros rode it made it even more desirable.

So it isn't shocking that the 1969 and 1983 geometry look so similar, but it is at little bit, shall we say, noteworthy. I suspect that is why repechage noted it.