The icon looks like the face and straps of a rectangular watch, with no face features. the straps are at the top and bottom of the watch face. There is a semicircle on the right side of the watch to look like a button.
This is a Apple Watch icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,700 icons, all in the same style and quality.