: Part of the Gravitymaster series, this watch featured "tough solar" power and Bluetooth connectivity for aviation-focused upgrades. G-Shock GR-8900-1ER
: Samsung improved its software to automatically track and monitor favorite health and fitness activities more accurately than previous models. Watch GR Upgrade 2018
If you are referring to a different "GR" model, these were also notable in or around 2018: Casio G-Shock GR-B100 (2018) : Part of the Gravitymaster series, this watch
: Mentioned in enthusiast communities like Reddit as a high-quality "upgrade" for dive watch collectors during that year. Samsung watch models explained Samsung watch models explained : The high-contrast screen
: The high-contrast screen allowed for highly detailed, customizable watch faces that mimicked the look of traditional analog watches. Other Potential "GR" Watches
replaced the Gear S3 and introduced several features often highlighted as "good features" in reviews from that time: Key Upgrade Features (2018 Model)
