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
Amazon.com: Leotop Compatible with Samsung Galaxy Watch 46mm/Gear S3 Frontier/Galaxy Watch 3 45mm/Classic Bands, 22mm Replacement Genuine Leather Cuff Strap with Stainless Steel Metal Buckle for Men Women (Black) : Cell Phones