How do I know which size Apple Watch strap to order?

Check the case size of your Apple Watch by turning it over and looking at the back. You'll see small text engraved around the sensors that says something like "41mm" or "45mm."

*NOTE: Series 1-3 42mm uses the large (44/45/46/49mm) size and Series 1-3 38mm uses the small (40/41/42mm) size.

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