I have seen ads, in the newspaper, offering to exchange WiR to/from CHF. The WiR bank forbids exchange. But there is a market. I hear that the rate is CHF 60 for WiR 100, i.e. the market is discounting WiR 40%.

Google the topic. I found this, but it an old article:
http://www.michaelheim.com/php/abzbaz8.php