=====#J======Rolex THREADED 28.65MM THREADED CASE INSERT VICEROY OTHERS WRISTWATCH CASE . MEASURES 5.40MM THICKNESS FRONT TO BACK. 28.68MM DIAMETER. THE THREADED PORTION MEASURES 27.74MM. THE INTERIOR OPENING MEASURES 26.23MM FRONT 26.23MM BACK AND A LEDGE INSIDE TO ATTACH THE MOVEMENT TO.  AN INSERT FOR THE EARLY ROLEX CASE THAT WERE THREADED INSIDE AND THE BEZEL AND BACK SCREWED ONTO THE INSERT. SOLD AS PARTS FOR A RESTORATION ALL MEASUREMENT AS CLOSE AS I COULD READ THE MICROMETER. .