What is a reference number? 25 June 2021 12:51 Every Oris model has a reference number. This is usually engraved into your watch’s case back. When you register your watch via MyOris, it will be registered to your personal vault. Related articles How do Oris reference numbers work? What is a serial number? How can I register my watch on MyOris? Product Manual I didn’t get my Oris watch from an authorised Oris retailer. Can I still register it at MyOris?