it does look like someone combined a campagnolo 'Sport' parallelogram with a 'Gran Sport' derailleur..
in his talk at this year's Cirque, Alexander von Tutschek did make a brief mention of common period-correct modifications, including one (i think) in which the single pulley 'Sport' unit was combined with a 'Gran Sport' to give a mechanism with a sprung upper pivot and improving shifting performance.. maybe this can explain part of what happened here ?.. i've never seen a 'Sport' up close to see exactly how they work, so i couldn't really say.. is there somewhere to attach the spring ?
Andrei Padlowski Glen Ridge, NJ
On Nov 7, 2007 11:29 AM, Kurt Sperry <haxixe@gmail.com> wrote:
> Those Sport and Gran Sport derailleurs look essentially identical
> don't they? I'm used to seeing the later comical Sport single pulley
> model (someone was having a very, very bad day when they designed that
> one), but this looks like nothing more than two names for the same
> thing.
>
> Kurt Sperry
> Bellingham WA
> USA
>
> On Nov 7, 2007 5:26 AM, Peter Söderlund <peso@glocalnet.net> wrote:
> > Hi
> >
> > When I bought a bike two days ago, so gave me the man I bought the bike
> > from a box with a lot of stuff. I thought it was only junk, but when I
> > was home again and looking trough it so found I, for example two
> > campagnolo rear derailleurs. I think they are from 51 or 52, one is new
> > and one is only slightly used. They are exactly the same, but on the ne
w
> > one stands it on the front campagnolo sport, on the other one stands it
> > campagnolo grand sport???
> >
> > I also found a simplex rear derailleur, it is only marked with " juy
> > simlex ". I wonder if some one has an idea how old it can be.
> >
> > Pictures can be found on this address:
> > http://goto.glocalnet.net/
> >
> > Excuse me for the bad pics, I really need to buy a new camera..
> >
> > Best regards Peter Söderlund
> >
> > Göteborg
> >
> > Sweden