Method #1 :
Look at your watch backside with small text
- Open the Apple Watch app on your iPhone.
- Tap the My Watch tab, then tap General > About.
- Find the Model field. You should see the part number that begins with "M."
- Tap the Model field. You should see the field update to show a five-digit number that begins with "A." This is your model number.
- Search for that Number to find the right products.