Wayne,
I did not look up the part numbers you list here, but I can tell you that t he pulley bolts on older NR rears were fully threaded, while the later type are threaded only over the last half-cm or so. I doubt that Campy estab lished different part #'s for the two types, but rather that it was a r unning change. I have a 1974 NR rear that has full threads and a 1977 that has the newer type, partly-threaded bolt. With Campy, there could have been some back-and forth over a few years as the transition was made. .. or perhaps not. Catalogs, of course, may or may not have depicted the change at the time it happened, or perhaps later, or perhaps not at all (t hough I'm pretty sure I've seen each bolt type depicted in one catalog or another).
The limit screws with chrome are associated with Super Record. The dull ones showed up on some early first gen SRs, I think, because my one and only first gen SR has the dull screws, but the chrome screws show u p on many or most first gen SR rears, and all the second gen SR rears I can recall seeing. As far as I know, the NRs always had the dull screws, bu t I'd not be the least bit surprised of late production NRs had the chrome screws. I believe SR stayed in prodution longer than NR, so as NR produc tion wound down Campy did use some SR-specific small parts on NR components , presumably after the NR-specific parts were used up. Interestingly, the very late NR rears use the inner parallelogram arm of the SR, even th ough the two rear ders had used different inner arms since 1978.
....okay, I just looked at your question again, and I gather that by "braze d stop" you are referring to the very early NRs with the cage stop that was brazed to the spring cover. On those, I would expect the fully threaded pulley bolts and non-chromed adjuster screws... but those units are rare enough that I have little direct experience.
Tom Dalton Bethlehem, PA USA
Hi all, I've just stripped, cleaned and reassembled one of these beasts, 1) are the pulley bolts #93/A threaded at the ends or like #933 or #3461 fully threaded? mine are fully threaded & secondly are the adjusting screws #99 chrome plated or just like the lesser plated ones, mine are chrome plated. I suspect these parts may have been replaced, but then again I could be totally wrong, afterall this item is a low milage item and overall is a very nice item. I do suspect thou that the mounting bolt is new, esp when comparing to the bottom bolt........regards wayne davidson Invers NZ.........