Super-Inax Sport derailleur

This derailleur was amazingly innovative. It is a proper parallelogram design, mounting on the drop out, with a low gear stop screw. With all this technology it came on to the market 8 years before Campagnolo’s Gran Sport.

Why is it a forgotten irrelevance? Possibly because of a lack of marketing punch, and probably because it was a single pulley design - and so doomed to deliver a relatively sloppy change.

I know of four variations of this basic design:

A bronze version branded Super JIC which has a cable adjuster and a relatively slim outer parallelogram arm.
An aluminium version also branded Super JIC which also has a cable adjuster, but has a chubbier outer parallelogram arm.
An aluminium version that is identical to the aluminium Super JIC, except that it has no cable adjuster and is unbranded and sold as the Super-Inax Sport.
A steel version that is branded Super JIC and has a cable adjuster, but has a very different b-knuckle and a differently shaped pulley cage.

At one point or another, this design of derailleur seems to have been called JIC Champion Sport, Super-JIC 49, Super-JIC Sport, Super JIC Course or Super-Inax Sport. I have decided to run with just two of these: Super JIC Course and Super-Inax Sport.

Finally I would note that these derailleurs share a number of distinctive small parts with the earlier (and very weird) Super-Inax models with a b-pivot that allows movement in both the vertical and horizontal plane. They all clearly come from the same factory.

This is an example of the aluminium Super-Inax version described above. Some of its features are

It has an aluminium b-knuckle with the top parallelogram pivot about 40mm below the b-pivot.
It does not have a cable adjuster.
The outer parallelogram arm is aluminium and is somewhat chubby, with no lightening hole drilled in the flange.
The pulley wheel is 34mm in diameter.
The pulley cage plates are relatively large.
It has a rather dull silver/grey finish.
It has no branding anywhere on it.

Derailleur brands: Super-Inax, manufactured by JIC?
Country: France
Date of introduction: 1942?
Date of this example: unknown
Model no.: unknown
Weight: 241g including hanger plate
Maximum cog: 22 teeth?
Total capacity: 8 teeth
Pulley centre to centre: not applicable
Index compatibility: friction
Chain width: 3/32” and 1/8”?
Logic: low normal
B pivot: sprung
P pivot: none
Materials: aluminium rear knuckle and parallelogram arms, steel front knuckle, pulley cage plate and hanger plate.