Omega Constellation Automatic Chronometer Cal 751 dated by serial number to 1969. This model Omega Constellation has a large but relatively flat tonneau stainless steel case, measuring 36mm across and has a white gold coin edge bezel. The silver dial features, stainless steel pencil hands, applied hour markers and a day/date display at 3. The date is quickset via pulling the crown to the second position. The weekday display is in English and is advanced by turning hands to midnight. The screw down case back has a polished finish and displays the Geneva observatory which signifies that it is a certified chronometer. The winding crown doesn’t have Omega logo but the crystal has the logo embedded. The bracelet fits a 19.5 (7 3/4 inch) wrist on it’s longest setting. The 24 Jewel Omega movement is working well and keeping accurate time. Photos are magnified and show details not seen by naked eye, the case measures xx mm across (not including crown) x xx mm lug to lug.