Watch Specification
Brand: Steelflier
Model:  SF730
Movement: Japan VK63 chronograph movement
Case back: 316L stainless steel
battery:SR936SW
Battery life: 3 years
Case material: 316L stainless steel
Watch mirror: bubble sapphire crystal with AR coating.
Water resistance: 200 m / 20 ATM
Luminous: Swiss BGW9 blue Super Luminous 
Crown: Screw-Down
Case back: Screwback Case
Watch Dimension
Case diameter: 39mm(without crown)
Case length: 45.5mm(lug to lug)
Case thickness: 12.mm 
Lug width: 20mm 
Our service
Warranty: 2 years 
Returns and Refund: 30 days return & refund service
Package: watch, warranty card, user manual, plastic protecting box
Style: men’s mechanical watch, men’s automatic watch, dive watch, luxury watch