|Note that the Cortina clamps around the right chainstay.|
Considering that a round, tapered stay might pose problems
to a secure mounting, there are two small grub screws on the
clamp to help secure it.
|The Nivex was almost certainly an|
inspiration for the Cortina.
According to the Disraeli Gears site, the Cortina weighed a pretty respectable 266 grams, which was quite a bit less than the Campagnolo Gran Sport of the same time period (that was made of bronze, remember). No doubt, it shifted better, too.
There doesn't seem to be a lot of information out there about the Suwe Cortina. There is a picture of one in Frank Berto's book, The Dancing Chain, but barely any mention of it in any detail. Disraeli Gears has the most info that I could find, stating that the Suwe company was based in Vienna, Austria, and that their main line of business (at least, based on the many patents that they held) was apparently in ski bindings and other ski-related products. There is no evidence of the company's existence after about 1969.
I don't have $400 to plunk down on a rare but interesting derailleur, but I'll probably be keeping my eye on the auction in any case, just out of curiosity.