Campagnolo Croce D' Aune Rear Derailleur: White Pulleys

Fairly rare and quite unique rear mech from the late 1980's.  I can't do the mechanics of this one justice, so here's words straight from the 1988 Campagnolo catalog:

The innovative design of the CROCE D'AUNE derailleur is an improvement on the above mentioned systems and achieves its efficiency through Campagnolo's patented" "TWIN-AXLE System". The "TWIN-AXLE System" is an articulation of the geometry of the derailleur which combines two movements to move the jockey cage across the freewheel while keeping it equidistant from all the cogs regardless of how big or how small they are in diameter.

The "TWIN-AXLE System" of this new derailleur works in this way: when the gear cable is pulled the derailleur rotates on its pivot bolt (fig. A) causing the jockey cage to alter itself to suit the increasing diameters of the freewheel cogs. At the same time, a rigid, stainless steel arm on the diagonal of the parallelogram moves the cage plate along the freewheel (fig. B) guiding the chain from one cog to another. The movement of the parallelogram is controlled by a return spring. This spring is not, however, preloaded like on other derailleurs which can cause needless friction. Thanks to the elimination of friction at this point the derailleur's shifting action is much lighter and smoother than other gear changers.

The "TWIN-AXLE System" of the CROCE D'AUNE derailleur is a new break-through in derailleur technology and is destined to set new standards for competition derailleurs. In races like the Giro d'ltalia and Tour de France where steep mountain roads torture both man and machine it is extremely important for the derailleur to perform flawlessly because one missed shift or slipped chain can be the difference between winning and loosing.

Condition

Great used condition.  Buttery smooth pulleys and springs.  NO scraping on faceplate or knuckles, but light scratches throughout.  Looks a bit nicer in person than in photos.

Details

• Model: B010-SM
• Short cage (30t cog max)