Pretty sure those stems were GB. For sure, many of the bars used with them were GB. I have several bars from higher end Schwinns (Superior, Sports Tourer, Super Sport) that are marked GB at the end of the bar, normally hidden by tape. On my Superior, the Schwinn Approved hubs are Normandy Competition, on lesser models they were often Normandy Sport. Note that in the 70's, Schwinn sometimes mixed Diacompe brake calipers with Weinmann levers or vice versa. As I noted before, the one brand of components I don't think I've ever seen rebadged as Schwinn Approved is Campy. I guess the name Campagnolo was famous enough, even in America, that it didn't need Schwinn's endorsement.
Regards,
Jerry Moos
Big Spring, Texas, USA
> From: Charles T. Young <youngc@ptd.net>
\r?\n> Subject: [CR] Schwinn-approved; was Re: What Rims for early 70's Paramount P-13???
\r?\n> To: classicrendezvous@bikelist.org
\r?\n> Date: Saturday, October 17, 2009, 10:21 PM
\r?\n> It has always seemed to me that the
\r?\n> Schwinn alloy stems with the "S" in a diamond (<S>)
\r?\n> were so similar to the GB stems that GB may have been the
\r?\n> supplier. Anyone given them close scrutiny or know if GB
\r?\n> made them for Schwinn.
\r?\n>
\r?\n> Also, were the ubiquitous Schwinn-approved hubs
\r?\n> private-labeled Normandy Sports?
\r?\n>
\r?\n> Charlie Young
\r?\n> Honey Brook, Pennsylvania USA
\r?\n>
\r?\n> Kevin asked:
\r?\n>
\r?\n> >>
\r?\n> >> I keep seeing this term......'Schwinn
\r?\n> approved'.......what is it with Schwinn?.......were they so
\r?\n> fussy and particular that everything had to undergo strict
\r?\n> testing to come up to their expectations and pass certain
\r?\n> things so as to be 'allowed' to be fitted to Schwinn
\r?\n> bikes!?
\r?\n> >>
\r?\n> >> You never see 'Trek approved' or 'Colnago
\r?\n> approved'.................
\r?\n> >> Just wondering.....and scratching my head.......
\r?\n> >>
\r?\n> >> Cheers
\r?\n> >> Kevin Sayles
\r?\n> >> Bridgwater Somerset UK