The RD is a transition generation derailer - first-gen parallelogram with the 90 degree corners and engraved logo, with second-gen pulley cage (open slot). One could argue that this is truly the official second-generation, while the version with the Campagnolo script logo is third-generation.

That is not taking into account the fact that the parallelogram top stop was revised during the run of the first-gen RD's - would that make the second variant it's own generation? Not in my book, but I may be wrong.

Confusing enough?

That said, could you post a photo of the reverse of the RD? I want to make sure it is not, by any chance, a first-gen with the earlier sprung pivot that just so happens to have a second-gen cage on it. Makes all the difference in the world as to what part(s) you need to get it back together.

-Kurt