Well, as I’ve said above, these are from 2003/4 – as you can see from the pictures, these are the silver aluminium type, now discontinued, and are very different in appearance from the new Centaur brakes.
They are becoming harder to find so I think that's reflected in the price - but I'm open to offers.
In 2004 Centaur was also towards the higher end of the Campagnolo groupset hierarchy:
Xenon
Mirage
Veloce
Centaur
Chorus
Record
I don't know how performance compares between new and old, but they look much nicer.