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
GALAXY WATCH SM-R800 latest model Unboxing and Honest Review | detailed explanations - YouTube
SM-R800 | SM-R800NZSATGY | HK_EN
SM-R800 | SM-R800NZSATGY | HK_EN
Amazon.com: Samsung Galaxy Watch 2019 (46mm) Bluetooth, Wi-Fi, GPS Smartwatch, SM-R800 - International Version (Silver) : Electronics
Amazon.com: Samsung Galaxy Watch 2019 (46mm) Bluetooth, Wi-Fi, GPS Smartwatch, SM-R800 - International Version (Silver) : Electronics