Kuhn Rikon 20 cm pressure cooker gasket for Duromatic, Durotherm pressure cookers. I bought this in Switzerland 30 or 40 years ago, at a time when I went to Switzerland every six weeks or so on business, for a pressure cooker that I no longer own. It is in the original unopened wrapping. 

The gasket appears to be in perfect condition. The cardboard tag is a bit worn, but otherwise everything is perfect. 

This auction includes just one gasket.

If the actual postage turns out to be less than the amount charged by Ebay, I will immediately refund the difference.