Automatic movement
Hack mechanism (second hand stops when crown is pulled out to set the time - standard feature on all genuine Rolex watches)
Sapphire crystal watchglass
Screws in the links. not pins
Rolex logo etched at 6 oclock 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
Full Stainless Steel band/case. and will never fade or wear
Solid back with characteristic Rolex green sticker
Screw-in watch crown
Luminescent hour markers/hands
Waterproof (can be worn for regular swimming with no problems)
All the appropriate Rolex markings in the correct places