Watch Specification
Model: SD1928B
Movement: Japan NH35 automatic, 41 hours of energy storage. 
Case back: 316L stainless steel
Case material: 316L stainless steel
Watch mirror: sapphire crystal with AR coating.
Water resistance: 200 m / 20 ATM
Luminous: Swiss C3 and BGW9 lume t 
Crown: Screw-Down
Case back: Screwback Case
Watch Dimension
Case diameter: 39mm(without crown)
Case length: 49mm(lug to lug)
Case thickness: 12mm 
Lug width: 20mm