AppleWatch Size Guide. Although Series 1, 2, and 4 have been discontinued, you may find these watches available at lower prices on e-commerce sites. However, our focus is on the officially available AppleWatch Series 8 (45mm) specifications - Display: 1.9 inches OLED; Camera: ; Processor: Apple S8; RAM: 1GB; Battery: 308 mAh The Apple Series 8 (45mm) is the large size of the Series 8 family and it comes with bright OLED display. Pros. Supports wireless charging; Screen-to-body: 66.64 % Peak brightness: 1000 cd/m2 aluminumcase size. 45mm or 41mm aluminum or stainless steel case size. 49mm titanium case size . Great screen area to feature a variety of watch faces with multiple complications. Apple Watch Ultra 2, Apple Watch Series 9, and Apple Watch SE require iPhone Xs or later with iOS 17 or later. Tofind your case size and more information, check the engraving on the back of your Apple Watch. Apple Watch Series 8 (GPS) 41mm case (Model: A2770) Apple Watch Series 2 Stainless Steel. 38mm case (Model: A1757) 42mm case (Model: A1758) Space black stainless steel or stainless steel AppleWatch Series 1 costs less (starting at $269, versus $369 for the Series 2). Series 1 (left) only comes in aluminum, while Series 2 (right) also comes in more expensive steel or ceramic 4uGP.