Just registered my SS Galaxy Watch SM-R800 that I have had for 5 years. Model and Serial in the watch matched what is on their website and the registration resolved it to
Amazon.com: Samsung Galaxy Watch 2019 (46mm) Bluetooth, Wi-Fi, GPS Smartwatch, SM-R800 - International Version (Silver) : Electronics
SM-R800 | SM-R800NZSATGY | HK_EN
For Samsung Galaxy Watch 46mm SM-R800/ R805 Nylon Canvas Fabric Sport Band Strap | eBay
Amazon.com: SAMSUNG Galaxy Bluetooth Watch 46mm (Silver) with Extra Charger : Electronics
SM-R800 | SM-R800NZSATGY | HK_EN
Samsung Galaxy Watch SM-R800 46mm Stainless Steel Bluetooth Or LTE - Good | eBay