Caliber Number / MovementMiyota 8215 (automatic with manual winding capacity)Power Reserve / AccuracyApproximately 42 hours ( 40 to -20 seconds per day)CrystalSapphire crystal with magnifierLumiBriteLumibrite on hands, indexes and bezelCase & Band MaterialStainless steel case with metal band (three-fold clasp with secure lock)Water Resistance50mCase SizeThickness: 12.9 mmDiameter: 40.9 mmLength: 47.8 mmOther Specifications21 jewelsDate displayScrew case backScrew-down crownUnidirectional rotating bezel