ROLEX Genuine 531-0 Crown 5.3mm Original Watch Repair Part 1.5 Rotation Verified. Please read carefully before purchasing. This is a genuine Rolex 531-0 crown, measuring 5.3mm in diameter. To ensure a secure fit and long-term functional reliability, this crown has been specifically selected and verified to achieve approximately 1.5 rotations (clockwise) when tested on a…