* Automatic movement.
* Hack mechanism (second hand stops when crown is pulled out to set the time ? standard feature on all genuine Rolex watches).
* Diver's extension to watch bracelet.
* Sapphire crystal watchglass.
* Screws in the links, not pins.
* Rolex logo etched at 6 o'clock position on watch dial.
* Rubber seal at trip-lock winding crown.
* Serial band/number on last link/lugs.
* Fliplock oyster bracelet, steelinox clasp, serial number on clasp.
* Solid back with characteristic Rolex green sticker.
* Screw-in watch crown.
* Luminescent hour markers/hands.
* All the appropriate Rolex markings in the correct places.