Also, will somebody please explain how the cut off year of 1983 was
>selected? What's magic about '83? Campagnolo's death?
Campagnolo's death seemed like the main driver to me. Dale will say, if he cares to.
Valentino took over and oversaw creation of the Campagnolo's "aero" group, C-Record...which works really well, btw, mainly because of the double-sprung rear derailleur (which is why the first-gen Rally is so nice to have).. and with new black pads the deltas work just fine, imho...cosmetically though, the C-record group was, as Cinelli famously opined, "brutto" (to some, anyway. I find it grows on one)...and, so, 1983 is where bicycle life as we know it ended...for parts, at least.
If you were to cut off at click-shifting, wouldn't the date be more like 1986? I forget when the first click-shift systems showed up on bikes, but wasn't it around then?
And 1986 was also, technically, the last year for the super Record derailleurs, yes?