This has nothing to do with undated NR derailleurs except that I noticed it when looking for mine. I have three rear derailleurs marked Patent 72. Two have the nylon bushing on the lower pivot, one does not. Does this mean that the addition of the nylon bushing, and accompanying change in the lower pivot bolt, was a running change that occured in 1972?
Steve Barner, Bolton, Vermont
> >From: kenneth denny <email@example.com>
> >To: firstname.lastname@example.org
> >Subject: Campy NR Rear Date: Fri, 18 Jul 2003 17:10:31 -0700 (PDT)
> >Hi Mitch,
> >The Campy NR was produced in four different versions with no patent date -
> >67, 68, 69 and post '84 (1984 was a re-issue that not only had no patent
> >date, but the pivot spring retaining bvolt was mounbted on the lower pivot
> >body, as opposed to the upper.
> >1967 was the first year of the NR derailleur. It was marked "Patent
> >Campagnolo" on the upper pivot body, with the lettering aligned
> >perpendicular to the pivot bolt. This year the derailleur was fitted with 9
> >tooth pulleys, the knurled spring pivot barrel is slightly shorter (16mm)
> >as opposed to later versions (19mm). The pivot stop was also shorter and
> >did not ectend to the end of the knurled pivot barrel as in later models.
> >The spring retaining holes that are drilled into the pulley cage are
> >oriented in four locations. (see attachment)
> >1968 was pretty muich the same as 1967, except that the word "Patent ___"
> >was oriented in the more familiar location adjacent to the cable entry.
> >Spring hole orientations are now in two locations. Knurled spring barrel is
> >19mm. (see attachment 2)
> >1969 is the same as '68, except that the pulleys are now 10 teeth and the
> >spring pivot pin extends to the end of the knurled spring barrel.
> >1984+ is a retro-derailleur and not worthy of discussion, for all intents
> >and purposes.
> >Please feel free to share this info with the CR group.
> >Take care,
> >Ken Denny