Driving system: mechanical Caliber: F7M42 Average daily deviation: +15 seconds to -5 seconds (static accuracy) Running time: more than 50 hours Case material: Stainless steel (SUS316L) Glass material (front): Double-sided sapphire crystal (sar coating) Glass material (back): Sapphire crystal Luminous Light: None Band Material: SUS316L Band width: 20 mm Band width: 20 mm ・Wrist circumference: 140 mm - 200 mm Clasp: Push-button clasp 　(Attached band: Cordovan (black), push-fold tri-fold type) 　(Attached band: Wrist circumference length: 150 mm - 190 mm) Weight: 145 g Vertical diameter: 49.0 mm Width: 41.0 mm Thickness: 13.8 mm Water resistance: 5 atm (5 bar) Magnetic resistance: Class 1 Other features: Limited edition of 30 pieces (official online store only), automatic winding (with manual winding), power reserve indicator, see-through back, 22 jewels, second hand stopper, date, replacement band (click here for information on replacing the replacement band)