@xsynchrome
The Resolution Centre is at the bottom of this page.
The dispute is Not As Described.
(The picture, title and description should match, btw.)
You have 30 days from delivery to open the Dispute.
State in the dispute that Delivery was by GSP, this will send it to a GSP specialist.
The GSP has a good reputation for settling Disputes quickly and amicably.
The main question here is whether the seller did not put the advertised watch in the box or whether it was removed somewhere along the line.
But that is not your concern. You will be refunded.