(Bloomberg) Credit Suisse Group AG peddled a series of unusual bonds in recent years that gave the Swiss firm insurance against the equivalent of a banking earthquake. The owners of those securities are feeling some tremors. The $461 million of notes, which are rarely traded, were quoted at distressed levels last month, with a sliver of the issue selling at around 60 cents on the dollar. Traders at JPMorgan Chase & Co. recently offered to buy the junior tranche of the notes for around the same price, according to two people familiar with matter who asked not to be identified as the prices aren’t public. The bond was quoted at par as recently as March, but doubts have grown over whether the bank’s twin scandals tied to the collapses of Archegos Capital Management and Greensill Capital might trigger the insurance and wipe out the principal of the complex securities. Credit Suisse’s turbulent year is turning into a test case for the unique instruments issued to help reduce the cap