Compatibility
Does the first generation wrist bands fit the 6th generation ? Are all bands the same ?
Apple Watch, watchOS 4
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Best reply
You can use a band that's designed for Apple Watch (1st generation) and Apple Watch Series 1, 2, and 3 with Apple Watch Series 4 and later and Apple Watch SE as long as the sizes are compatible. Bands for 38mm and 40mm cases are compatible with each other, and bands for 42mm and 44mm cases are compatible with each other. For more info, see:
Change your Apple Watch band - Apple Support