Greetings from Italy.
I own the following components:
- 1991 Campagnolo Chorus crankset, 170mm, and 42/52
- 1989 Croce d'Aune rear mech.
They are new in box.
In the red circle of the rear mech I pointed out the screw that allows the tension adjustment on pulleys' arm. This feature belonged only to Record and to Croce d'Aune groups. The only difference among Record rear mech and Croce d'Aune one, was the kind of pulleys: each Record pulley spinned on a 12ball adjustable bearing. Croce d'Aune was the 2nd top group after Record. The following year Campagnolo named "Chorus" the Croce d'Aune group and eliminated "Croce d'Aune" name. On Chorus crankset you can appreciate the super-shining finishing and the self extracting bolts.
Please let me know if are interested in them or you're looking for something else.
Regards.