Orient 21-Jewel Automatic Aviator Flight Watch with Black Leather Strap ER2A002F Imported Orient 21 Jewels Self-Winding Automatic Movement, Oscillation Frequency: "21,600 oscillations per hour (6 beats per sec)" Stainless Steel Case, Leather Strap Mineral Crystal, Date Display, Luminous Hands and Markers Case Size: 42mm Diameter, 12mm Thickness Water Resistant - 100M, Screw Down Crown and Case Back