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The easiest way is to simply turn your Apple Watch over and look on the back.  There will be an engraving around the heart rate sensor which will tell you which model and size you have. 

If you can't read the engraving because it is damaged, scuffed, faded, then you can go into your iPhone watch app and go to Settings  → General → About →Model.  Then you can simply do a Google search and your model should show up.

You can also follow Apples official support document for finding your Apple Watch model.

Once you find out your Apple Watch size, you can read below to find your exact Apple Watch Series:

Small Apple Watch Series: 

• 38mm, Apple Watch Series 0, 1, 2 or 3
• 40mm, Apple Watch Series 4, 5, SE or 6
• 41mm, Apple Watch Series 7, 8, 9

Large Apple Watch Series:

• 42mm, Apple Watch Series 0, 1, 2 or 3
• 44mm, Apple Watch Series 4, 5, SE or 6
• 45mm, Apple Watch Series 7, 8, 9
• 49mm, Apple Watch Series 8, 9,

All orders over $40 will receive free shipping within US (sub-total must be $40 or more). Express shipping for urgent orders available at check-out.

Anhem orders are eligible for refunds, exchanges & store credit returns within 45 days from the date of purchase.

Returns must be in new and unused condition.

Returns for exchanges and store credit will receive a complimentary free return shipping label for your convenience.

Start your return.

All Anhem products are covered under warranty from all manufacturing defects for 12 months from the original purchase date.