I was taking a look at a set of GB Synchrons on ebay and was curious if anyone has had any experience with these? They look like an early pre-cursor to dual pivot. I know they were also later manufactured by Altenburger (sp?) as well.
Anyhow, if anyone knows how they stack up against modern dual pivot, or older sidepull and centerpull, I'd love to hear it.
Thanks.
Sean Flores
San Francisco, CA