How to find last location of device
How to find location of device
Apple Watch Series 3, watchOS 6
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Best reply
See:
If your Apple Watch is lost or stolen - Apple Support
Find My is the only way that you can track or locate a lost or missing device. If Find My isn't enabled on your watch before it goes missing, there is no other Apple service that can find, track, or otherwise flag your device for you.
Good luck!