Please visit this page and click Get Started to enter your serial number. When registering your product, if you receive an error, please try using a lower-case letter as your first character. If you still have an issue, please email customerservice@stundenglass.com with a picture of the authentication sticker on the back of the box and matching serial number etched onto the body. For security purposes, please note that we are not able to register the product for you.

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