I have a Chorus Exa-drive 12-21 in very good condition and a Veloce 13-23 in reasonable condition. The Veloce will only fit first generation 8 speed hubs whereas the Chorus fits both.
Edit: The Veloce is a mongrel with the 13,14,15 and 16 badly discoloured but I do have the original 12,13,14 and 15 which are in much better nick.
Mark.