Watch Specification:
Model: SD1939S 
Movement: Japan NH35 automatic, 41 hours of energy storage. 
Case/Bezel material: Germany CuSn8 bronze 
Bezel: non-rotatable Cusn8 bronze Bezel
Watch mirror: sapphire crystal with AR coating.
Water resistance: 300m
Helium Escape Valve ：No
buckle: stainless steel
Luminous: Swiss C3 green super-luminous light 
Watch Dimensions
Case diameter(without crown): 47mm
Lug to lug: 52mm
Case thickness: 16.1mm
band width: 24mm
Our Service:
Style: Automatic watch, dive Watch, Luxury Watch, bronze watch 
Warranty: 3 years 
Returns policy: 30-day return and refund
Package: watch, box,warranty card, user manual