The Seiko 5 SRPE60K1 is based on the SKX and shares many design elements with this watch. To make it more elegant, Seiko used a two-tone design, which means a combination of gold and steel elements, making it much more elegant and classy, whilst still retaining a touch of sportiness. Specifications: Movement Caliber Number 4R36 Movement Type Automatic with manual winding Duration Approx. 41 hours Exterior Case Material Stainless steel Crystal Hardlex LumiBrite LumiBrite on hands and indexes Clasp Three-fold clasp with push button release Other Details Water Resistance 10 bar Case Size Thickness: 11.5 ㎜Diameter: 40 ㎜Length: 44.6 ㎜ Weight 142.0 g Other Specifications Screw case back See-through case back Three-fold clasp with secure lock Other Features 24 jewels Day/Date display Stop second hand function