Watch Specification:
Model: SD1903S
Movement: Japan NH35 automatic, 41 hours of energy storage. 
Case back: 316L stainless steel
Case material: CUSN8 Bronze 
Watch mirror: sapphire crystal with AR coating.
Water resistance: 200 m / 20 ATM
Luminous: Swiss C3, Green light 
Crown: Screw-Down
Watch Dimension:
Case diameter: 46.5mm(without crown)
Case length: 54.17mm
Case thickness: 14mm 
Lug width: 22mm