Well I have a pretty good collection of early Rolex's and a lot of Rolex books.Well this watch has been through 2 different Rolex dealers in London and they believed it to be genuine, as do I.
I just needed help with the model but as you have all decided it is a fake I will write to Rolex for clarity
The site you link to is Marcus Hardy 'THE EXPERT' on RolexIs that not a Rolex 'Rebberg' movement....
NAWCC - Rolex Rebberg | TimeKeeperForum.com
Rolex Officer's Watch For Sale In UK 1923 | Vintage Rolex Watches | Vintage Watches
Personally, without having the watch in hand... I would have said the Case and Movement could be original... dial probably refinished.