Gear S3 Frontier vs Galaxy Watch3 - Technically it's a marginally thinner but smaller housing, narrower bezels, and weighs significantly less. It feels thinner than it looks, maybe due to the back
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Samsung Galaxy Watch 3 - Wikipedia
Insten Stainless Steel Metal Band For Samsung Galaxy Watch 3 45mm (2020) / 46mm (2018) / Gear S3 Frontier, Replacement Strap For Women Men, Silver : Target
Samsung Galaxy Watch vs Samsung Gear S3: What's changed? | T3