TheApple Watch Series 7 watch features 41mm and 45mm always-on screens, the largest Apple has ever made. The Series 6 had 40mm and 44mm sizes while the Series 3 watch has 38mm and Wetested and reviewed all Apple Watch models, comparing screen size, design, battery life, features, fit and more. T3. 27 YEARS OF SMARTER LIVING. the best Apple Watch option for you. TheApple Watch SE 40mm GPS height is 1.57 inches (40mm), width is 1.34 inches (34mm), and depth is 0.41 inches (10.4mm). This Apple Watch SE has a diagonal screen size of 1.533 inches (39mm), with a 324 x 394 pixels resolution at 326 ppi. The weight of the GPS variant is 30.49 grams, and that for GPS + Cellular is 30.68 grams. ModularDuo. Next on this list is an Apple Watch Series 7-exclusive watch face, the Modular Duo, which provides access to two large complications, and one smaller unit for quick access and simple Comparisonof the Apple Watch Series 7, Watch SE and Watch Series 3 showing the differences and similarities. Size options were 40mm and 44mm and there were GPS only and GPS and Cellular Ds3J.