Quote Originally Posted by Raffe View Post
Well, not quite.

The papers would give it away. Either the buyer would get the original paperwork and then watch and papers wouldn't match - or he would get fake paperwork and then invoice and watch/paperwork wouldn't match. Provided the AD would have a system to make sure correct serial (as delivered from Rolex) would be on the invoice (expected) and buyer would check serial number against paper work/watch (strongly recommended, if only to avoid other trouble like mixed up watches).
I bet lots of people leave an AD with a nice new watch having not checked the serial number against the papers. They could then wear the cuckoo watch for years only to discover its true status perhaps years later when it fails or goes for service. Then what?