AG Sigg is a Swiss aluminum processing company in Frauenfeld. I've never seen a straight answer on what these were made for.. could have been an attempt to show the Swiss government how coinage could be made in aluminum, or just tokens for marketing purposes. I have a couple of these, somewhere.
Picture of a 5 Rappen with a list of others: http://userwebs.psknet.com/tbirde/t.../Medals.html (just search the page for "Sigg")
Picture of a 5 Rappen with a list of others: http://userwebs.psknet.com/tbirde/t.../Medals.html (just search the page for "Sigg")



















