> I think when Chuck Schmidt, Gabe Konrad and I were working on aspects of the
> Campy Time Line, we finally researched the issue and discovered that the SR
> group, including the derailleur, was introduced in the fall of 1973 and
> winter 1974 at the various trade shows.
> The components as previewed did not make it into actual production as
> displayed. One of the differences were the black colored chain rings which
> were reported as being a strange new alloy and "black clear through." They
> ended up being silver aluminum ally as we now know. The preview rear
> derailleur was pretty much the same in its production form.. BUT the reality
> was that the consumer (non pro-team, etc.) might not have had the ability to
> purchase a SR group for at least a year after the introduction. So
> functionally the SR stuff was really distributed until maybe 1975ish...
So the pat 73 NR derailleur is probably more correct for the '74 Masi GC than a first gen SR. Thanks for the detailed info, again not readily available from the catalogs.