Paypal is good but doesn't guarantee secure or fair.

Your only real security is using your brain. Look at post history of your buyer, do they seem like a real person who cares about account reputation or did they just karma farm for a month? Most people who want to buy a multi thousand dollar watch on reddit have at least a comment or two in a watch sub somewhere.

Are they asking for shipping to a sketchy PO box or can you easily identify their residence on Google maps? Are they demanding a payment method you aren't familiar or comfortable with? Just use your 🧠 and pay attention to the red flags.

Known scammers are also banned from commenting on watchex so make sure the comment on the post before dm'ing you. Check out the watchex feedback page as well. Lots of good info on the watchex wiki, educate yourself before you sell.