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
Samsung Gear S3 Frontier 46 mm Steel Case with Black Silicone Band Smart Watch - Black (SM-R760) for sale online | eBay
Samsung Gear S3 Frontier review: Outclassing most smartwatches in the market - SamMobile - SamMobile