Specifications Designed, assembled by hand and fully adjustmented in Kawagoe Japan. CASE: Brushed 316L Stainless Steel Screw Down Caseback Diameter (12H to 6H): 42 mm Lug to Lug: 43.5 mm Lug Width: 22 mm Height: 16 mm (including domed crystal) CROWN: Brushed 316L Stainless Steel Screw Down Location: 3.8H position Diameter: 7.0 mm MOVEMENT: Seiko Instruments/TMI NH36 (Automatic Mechanical) Hacking and Manual Winding Functions Accuracy: -20 ~ +40 seconds/day Beats Per Hour: 21,600 24 Jewels Power Reserve: 40 Hours DIAL & HANDS: luminous: C1 CRYSTAL: Crystal: Double Dome Sapphire crystal with inner AR Blue coating BEZEL Brushed 316L Stainless Steel BEZEL INSERT Ceramic BAND: Solid Stainless Steel Lug Width: 22 mm"Clasp side: 20mm" Maximum Length: 190 mm (alone) Minimum Length: 120 mm (alone) WATER RESISTANCE: 20 Bar / 20 atm / 660 ft WEIGHT: With Stainless Bracelet (at full length): 230 grams