In 71/72/73 timeframe the schwinn lightwight pages list the Campagnolo Gran Tourismo long cage derailleur as coming on the P15s.
Just found a picture of one... looks a bit wild to me ! (Like the look of the red 'C' s on the thing !)
Then I also read about the 'early 'Rally model derailleurs, from I think it said.. 1974.
How well do these two derailleurs work ? I saw the reference from CR that said the Rally was a good performing unit.
(How did they compare to the cyclone-GT's ??)
Thanks for any thoughts