Robert Broderick pointed me to his excellent gallery of Shimano catalogues already scanned. An excellent page that points out the fact that there were both types of hub available is:
http://www.wooljersey.com/
David -- David Bilenkey Ottawa, Ontario, Canada dbilenkey@sympatico.ca
http://www.wooljersey.com/
classicrendezvous-bounces@bikelist.org wrote:
> I've managed to find my 1980 Shimano catalogue/flyer. I'll scan the
> relevant bits later today or this weekend. But for the moment I'll
> just say that there were two Dura Ace lines in this
> catalogue. The 7100 series with
> the
> screw on freewheel type hubs and the Dura Ace EX (7200)
> series that had
> all
> the 'innovations' such as DD pedals, freehubs and Direction 6 and the
> lot. So Tom is correct there wasn't a screw on DA EX hub, but
> there was a DA
> hub
> offered concurrently. I agree that the 7400 series was a
> swing back to appeal more to the pro peloton. I'll also agree
> that for 600 and DA
> lines
> the addition of EX was a signifier of the cassettes, but
> cassettes were
> also
> found the Altus and Selecta lines of components.
>
> Once I get this scanned I'll put it up in my wooljersey album.
>
> David
> --
> David Bilenkey
> Ottawa, Ontario, Canada
> dbilenkey@sympatico.ca
>
> http://www.wooljersey.com/