I think the time line was most accurate on early '50's on the Altenburger
components.
I'll be selling a 56cm / 22" Durkopp road bike with an Altenburger rear
derailleur, 4-sp F&S cassette hub. It'll also have NOS Altenburger wood
reinforced sew-up rims, and Altenburger Synchon brakes, Scheeren aluminum
bar and stem.
Bike will available this fall, first to the list.
When I was in Solingen, Germany, living at the Patria bike factory for 9
months back in '51 my bike had a 4-sp chainstay "A" derailleur just like you
are speaking of.
The parallelogram design worked very well with the closer ratios we used
then.
Ted Ernst
Palos Verdes Estates
CA USA
>I have lost the link to the Cinelli we have been discussing.
>
> In the photos it looked like the Altenberger rear derailleur bolted
> directly to the chainstay. Is this correct? I would have thought that
> the chainstay couldn't handle the stress.
>
> Best regards,
> Marcus Helman
> Huntington Woods, MI