Movement Caliber Number V198 Movement Type Solar Accuracy ±15 seconds per month Duration Operating for approx. 6 months (when fully charged) Exterior Case Material Stainless steel (hard coating) Crystal Sapphire crystal LumiBrite Lumibrite on hands and index(es) Clasp Three-fold clasp with push button release Other Details Water Resistance 10 bar Case Size Thickness:  11.8  ㎜ Diameter:  44  ㎜ Other Specifications Screw case back Other Features Alarm function (single-time alarm) Chronograph up to 24 hours in 1/5 second increments Day/Date display Overcharge prevention function Perpetual calendar to the february 28, 2100 Power reserve indicator