One thing that I think has emerged from this thread, however, is that there were no Gran Sport hubs from that era. I believe the hubs that came with the Gran Sport group are properly called Nuovo Tipo, and are an extension of the earlier Tipo second-tier hubs. Maybe they were renamed "Gran Sport" at some point, but I have yet to see evidence of that happening. Thus the only true "Gran Sport" Campagnolo hubs may be the very early ones that pre-date the introduction of the Record model as Campy's top-tier hub. The Nuovo Tipo hubs do seem to get referred to as "Gran Sport," so it's interesting to discover that this is actually incorrect.