Assorted Models of The Hydroconquest GMT SeriesModel : Polished 316F Stainless Steel, Black Ceramic GMT Bezel, Assorted Dials as Shown, Superlume Markers, Stainless Steel Link Bracelet with with Insignia Single Fold Deployant ClaspMovement: Nickle Plated Japnese Miyota 9015 Automatic Movement,21J, 28800bph, Insignia Rotor,Functions: Hours, Minutes, Seconds Blue Dimensions : Dia 41 mm x 12mmMaterial : 1 piece 316F Forge Stainless Steel Casework Back : Solid Caseback with Serial Engraving on Case rims... Crown : One-piece Screw down crown with o ring Crystal:Sapphire CrystalWater-Proof to 30m at Factory