Grand Seiko Spring drive SBGA439

Brand: Grand Seiko 
Reference: SBGA439
Movement: Spring drive 
Caliber: 9R65
Dial Color: Blue
Glass Material: Dual curve sapphire glass with anti-reflective coating 
Case material: Stainless steel 
Bracelet/Strap: Stainless steel 
Back: Screw back
Case Diameter: 40 mm 
Thickness: 12.3 mm 
Weight: 157 g
Precision: ±15 seconds/ month 
Water-resistance: Waterproof to 100 meters / 330 feet
Remarks: Screw down crown, Power reserve display,