One point of interest here, FWIW. My 72 Chromed Paramount Tourer (seen at the Cirque 2003) has a "NERVEX" stamped bottom bracket. In fact, I think it was either Brian B. or Larry B. that at some time in the past noted it's irregularity for such a late year, if I'm remembering correctly. To pre-empt the next question, the serial number is L725. There are also a series of dimensions lightly stamped in just after the Nervex stamp.
In a message dated 7/9/2003 1:22:53 AM Eastern Daylight Time, classicrendezvous-request@bikelist.org writes:
> jimmy,
>
> I'm not a Schwinn expert by any stretch, but I understand that Nervex
> Pro lugs were introduced around 1959 or 1960. I think Schwinn stopped
> using the Nervex BB shell sometime around 1963-65. Many bikes from many
> nations seem to have a similar cutoff period for the use of Nervex BB
> shells, but I don't know why. The deffinite exception would be Peugeot.
> I remember my 1971 PX-10 still had a Nervex BB shell. I think the French
> threaded shells persisted much longer than the English or Italian thread
> versions. My '62 Masi Special has a Nervex shell but I've not seen a
> Masi newer than about 1963 with one on it.
>
> I haven't checked out your frame, but I would say it's the older date as
> opposed to a bike from the 70's.
>
> Brian Baylis
> La Mesa, CA
> >
> > I have just got a paramount with seriel # H75 and thought it was a 75model
> > year.Using waterfords dating system it shows to be a 1961 bike? The
> question is
> > did they use nervex pro lugs and bottom brackets and campy dropouts back
> then
> > and what year did they start using these parts when building frames.
> >
> > I also just received a dura ace dropout and der. hanger alignment tool and
> it
> > looks to be like a well made tool, did shimano make a complete tool set
> like
> > campy?
> >
> > Jimmy Katynski
> > Madison Heights Mi