It does appear you are (possibly/probably) correct, as all the rest of the components match up with what's on the bike, but that still doesn't explain one thing - the bar wraps, or "soft sleeves", as they're listed on the spec sheet...or, to be more specific, that they have what appears to be factory-cut openings for the shifter cables running along the bottom side of the bars, from the shifters, just to the point where the bars start to curve upward. Again, I am NOT saying I am right, & you are wrong...I'm only questioning/curious as to why, if the bike originally came with downtube-mounted shifters, why would the original (and, according to the spec sheet, they are the originals) "soft sleeves" have factory-cut holes for bar-end shifters?

Also, an interesting thing I discovered from viewing the spec sheet was that, instead of the frame sizes being measured in cm, as almost everyone else did at the time, it's listing the frame sizes in inches (21"-25"), so, based on my original assumption that this was a 58cm bike, I'm now going to assume it's a 23" frame. Anyone have ideas, or actual/factual knowledge, as to what the true value of this bike is? Even with the shifters & derailleurs swapped with SunTour components, the remainder of the bike is still original, including the bike-mounted pump, and, again, with the exception of the expected wear on the saddle, the bike is in near-perfect condition.