The Submariner Mod - GRAY LIGHTNING is a dive-inspired Seiko mod that means business. The Gray Lightning colorway on a unidirectional rotating bezel gives this Seiko mod an unmistakable underwater character — bold, functional, and built to last. Powered by the NH35 automatic movement — 24 jewels, 41-hour power reserve. Screw-down crown and solid case provide 10 ATM water resistance. 904L stainless steel throughout with BGW9 SuperLuminova for low-light legibility. Movement: NH35 Automatic — 24 jewels, 41hr power reserve Case material: 904L stainless steel Crystal: Sapphire with anti-reflective coating Bezel: Unidirectional rotating ceramic insert Bracelet: 904L stainless steel Case size: 40mm Crown: Screw-down Water resistance: 10 ATM Lume: BGW9 SuperLuminova Free worldwide shipping