Find the Apple Watch model number
On the paired iPhone, open Watch app, then My Watch > General > About. Apple says tapping Model Number reveals an A-number model identifier. Use that identifier to describe the watch as precisely as possible.
Include the details that distinguish it
Add the watch’s model name or identifier, condition, and quantity. The intake also asks for your ZIP code and a contact method so the New York team can review your submission and follow up.
Preparation guidance from Apple
Apple’s instructions for unpairing and preparing an Apple Watch explain the steps associated with removing it from your account and preparing it for a new owner. Consult the official guide before you part with the watch.