Case material: Steel; Charge: Automatic; Conditions: New Presentation condition : With dealer guarantee ; Model: Constellation Price on request Gmtbroker Reference: 123.10.31.20.55.001 Omega 123.10.31.20.55.001 Complete Details: Stainless steel case and bracelet White mother-of-pearl dial with 11 diamond hour markers Displays date at 3 o'clock Omega 8520 Co-Axial Escapement movement Power Reserve: about 50 hours This watch is also known as 12310312055001