The Centaur was launched in 1989 as a lower cost alternative to the 1988 Campagnolo Euclid. As far as I can tell the only difference was that the inner parallelogram plate was a steel pressing - which was presumably marginally cheaper than the Euclid's aluminium forging.
I believe that this is a second generation Campagnolo Centaur from 1990 - with a cable adjuster.
Some relevant details are:
- There is a spring adjuster on the p-pivot.
- The cable adjuster is round and threads straight into the aluminium of the b-pivot.
- It has a single parallelogram spring using ~2.0mm wire.
- The inner parallelogram plate is a steel pressing.
- The cable clamp nut is a smooth Allen key item.
- The pulley wheels are a conventional ball-bearingless design in black.
- The inner pulley cage plate is steel and has a spoke deflector.
- Derailleur brands: Campagnolo
- Categories: Campagnolo - mountain bike madness
- Country: Italy
- Date of introduction: 1990
- Date of this example: unknown
- Model no.: Q010-SM
- Weight: 296g
- Maximum cog: 30 teeth (Campagnolo)
- Total capacity: 32 teeth (Campagnolo)
- Pulley centre to centre: 53mm
- Index compatibility: 8 speed
- Chain width: 3/32
- Logic: top normal
- B pivot: sprung
- P pivot: sprung
- Materials: largely aluminium with a steel inner parallelogram plate and inner pulley cage plate