I wouldn't be surprised if this had been discussed before, but couldn't find it on Chuck's excellent web site (velo-retro.com), nor in the CR archives:
When did Campy change from "Open C" to the later "Closed C" on shift levers, QR levers, etc.
Italophile today...
Thanks,
--
Jan Heine, Seattle
Editor/Publisher
Vintage Bicycle Quarterly
http://www.mindspring.com/