Product Number: NH9144-55L Movement Number: 8227 Power Reserve: Mechanical (Automatic + Manual) Accuracy: -20 to +40 seconds per day (average daily error under static conditions)* Power Reserve: Approx. 42 hours (fully wound) Weight: 137 grams Thickness: 11.2 mm Case Width: 38.9 mm Case Material: Stainless Steel Case Finish: Gray Plated Strap Material/Type: Stainless Steel Triple-Fold Push-Button Strap Strap Width: 20.0 mm Strap Adjustment Range: 128-196 mm Crystal: Sapphire Crystal Water Resistance: 100M Skeletonized at 7 o'clock Transparent Case Back Frequency: 21,600 vibrations per hour Jewels: 21 24-Hour Display Easy Adjustment Limited Edition Packaging Box