* 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.

* rubber seal at trip-lock winding crown.

* serial band/number on last link/lugs.

* full stainless steel band/case,will never fadewear.

* solid back with characteristic rolex green sticker.

* screw-in watch crown.

* all the appropriate rolex markings in the correct places.