You'll probably just have to wait and see what happens.I don't feel very comfortable after seeing all these replies, i should have done my research before.
This is the tracking he gave me: https://t.17track.net/en#nums=QP765663626GB
Prestigewatches.co
Everything being dealt with over Whatsapp, a UK number
The best that can happen is that you receive a watch from a well-known factory but for which you most likely paid far too much.
The worst that can happen is that you receive nothing at all.
You live and learn!