There is a very simple way to ensure that you are buying a genuine Secrid product: check that there is a unique serial number engraved inside the aluminium casing. You can register this number online on the official brand website. After registering, you will receive a certificate of authenticity by e-mail and a third year of warranty.
To ensure the authenticity of your card holder Secrid, you can also check whether your retailer is listed as an official retailer on the Secrid website.