EDCO Competition (1986? racing version) derailleur

During the 1980s and 1990s, EDCO, a Swiss company that made beautiful Swiss products with precision Swiss bearings - bottom brackets, headsets, hubs, all that good stuff - decided that it wanted to offer complete groupsets.

Its chosen approach was to buy in components like brakes and derailleurs. EDCO sold its high-end Swiss bicycle jewellery at high-end Swiss prices - so, coming from French-speaking Switzerland, it was looking for the very best derailleurs that the Francophone world could provide.

My knowledge is a touch sketchy, but I am aware of seven generations of these EDCO derailleurs:

The first EDCO derailleur that I remember, possibly from 1984, was a rebranded Simplex SLJ6600 T. This was, arguably, the top of Simplex's range at the time.
Then, possibly in 1985, I think they used a rebranded Simplex SLJ5500 T. This was arguably a step down from the SLJ6600 T, but was marginally lighter, and possibly more 'racy'. Or they may have made the change because Simplex was in some chaos at the time.
In 1986? they dropped Simplex and adopted a rebranded version of Sachs-Huret's top-of-the range New Success (47.1D). This had a cleaner, more modern, look that fitted better with the EDCO aesthetic. At the time Sachs-Huret also made a lot of noise about how they were determined to build a top-quality technically advanced brand. Finally, I think that EDCO may also have offered a version of the long cage Sachs-Huret New Success Touring (47.1T).
In 1988? EDCO moved into the world of indexing with a rebranded Sachs-Huret New Success ARIS (47.2D). The EDCO version of this derailleur had something of a cult following, because it was anodised silver, rather than the grey colour of the Sachs-Huret original. Again, I think that EDCO may also have offered a version of the long cage Sachs-Huret New Success ARIS Touring (47.2T).
For 1990? EDCO moved up to the 8-speed Sachs-Huret New Success Sport (54.01D). I don't know if EDCO offered a long cage version.
In 1994? they moved on to the Sachs New Success Sport (RNS 00). This was offered in a choice of 'looks' - silver anodised for the 'racing' groupset and with a black & red outer parallelogram plate for the 'triathlon' groupset. EDCO additionally offered the long cage Sachs New Success MTB (MNS 00) derailleur both as part of a touring groupset and also as part of a mountain bike groupset.
And finally in 1996? came a version of the Sachs New Success (RNSS0). I do not know whether touring and other variants of this were offered.
...

And there is probably more that I have forgotten (or never even knew) about.

This is a beautiful, unused, example of the third generation described above. It is a rebranded Sachs-Huret New Success (47.1D).

Some distinguishing features include:

It is all silver.
It is the short pulley cage version. This has shorter parallelogram plates (40mm) than the ‘touring’ version (which has 47mm plates).
The inner parallelogram plate is aluminium and has a oval depression in its centre.
The cable clamp bolt takes a 6mm Allen key.
The adjustment screws are labelled 'L' and 'H'.
The inner pulley cage incorporates a spoke protector at the tension pulley.