How do I identify if my Apple Watch Ultra is Original?
apple watch ultra model a2859 original o fake
[Edited by Moderator]
Checking the serial number inside the band slot and the Apple Logo on the backside would be the most obvious signs of a genuine Apple Watch Ultra:
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copied from: How to find the serial number or IMEI for your Apple Watch - Apple Support
But, remember, that the Apple Watch Ultra A 2859 has been optimized for use in China mainland, and not all features might be available and the hardware might not support other carriers.
Apple Watch - Carriers - Apple