Detailed specifications:
Model Description:  SM8020C Vietnam War w-22176 Diving Military Watch 300M
Movement: Seiko Time Module Quartz
Lume: Super luminous SLC3
Case:45mm (without including Crown)
Lug to lug: 55.25mm
Case Type: Round
Case Material: Stainless Steel
Case Colour: Sand blasted & IP black
Crown: Botton screwed-in, Crown screwed down
Bezel: One way Rotating Bezel 60-tooth reverse aluminum patch (aluminum patch size:42.40*34.30mm*1.0mm)
Height: 15mm
Diameter:45mm
Bracelet Material: Nylon Nato
Dial Color: Black 
Lug spacing:22mm
Index Colour: Super Slc3 Luminous
Glass: Single bridge mineral plus hard Glass
Gender: Men & Women
Water Resistant:30ATM
Glass size:33.0*3.5mm+0.10 ( Diameter &Thickness size+Optical margin)
Domed crystal glass
Crown: 7.0mm screwed
Waterproof level: 300 meters waterproof. No hot water