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 46mm R760 Bluetooth Smartwatch Black FAIR Condition 689283955766 | eBay
Amazon.com: Samsung Gear S3 Frontier SM-R760 Smartwatch, International Version, No Warranty : Everything Else