Open the Watch app on your iPhone
Tap General
Tap About
Find the Model Name and Model Number
Check the back of the Apple Watch for the engraved model details
Compare the model number with Apple’s Apple Watch identification page
Check the size and case material in the Watch app or on the watch itself
Look at the watch face size and band compatibility
Use the serial number in the Watch app or on the watch and check Apple’s coverage page
Match the model number to the Apple Watch generation and series