Swiss  25 Jewel ETA automatic movement (same movement that is used in  genuine Rolex Tudor Submariners).
Serial  number (accurate) and model number engraved between the lugs.
Hack mechanism (second hand stops when crown is pulled out to set the time standard feature on all genuine Rolexes).
Genuine sapphire crystal.
High-grade full, solid stainless steel band, case and crown (not  stainless steel coated).
Band is linked by threaded screws, not pins.
Solid back with green Rolex holographic sticker and model number.
Solid screw-down back removable by genuine Rolex tool.
Laser printed dial.
LARGE 2.5X Date Magnification, as per the ORIGINAL Yachtmaster.
Bidirectional  turning bezel, exactly as per original Yachtmaster.
Limited  edition red second hand.
One-piece solid screw down crown with Rolex engraving, trip-lock.
Perfect weight and feel.