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The current driving licence in credit card format has an unrestricted validity. Provided that you own an old blue driving licence, you can keep this either or, however, against a fee (depending on the residence canton) and by submission of the document “application for exchange of the Swiss blue diving licence” exchange it in a drivning licence in credit card format.
Should you however change the canton or your name, the driving licence is issued to you definitively in the credit card format!
Illustration of the currently valid driving licence