Does the serial number identify my watch

lorean208 wrote:

I am unable to use the Apple Watch. The previous owner left the activation lock on.

The previous owner should have followed the steps listed in: What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support

None. If the previous owner won't help, then you have a useless device.

Activation lock cannot be bypassed. Its an Ant-theft mechanism. Return it if you can.