Dial: Sun satin-finished black, analog. Calendar: Date aperture at 3 o'clock. Functions: Hours, Minutes, Seconds, Date, Dual Time.Clasp: Triple folding buckle with security push-pieces, Stainless Steel. Crystal: Antiglare (1 face) scratch-resistant domed sapphire crystal. Water Resistance: 5 atm/50 meters/165 feet. Case measurements: 43 mm in diameter x 11.4 mm thick. Strap measurements: 21 mm wide x 8 in long. All measurements are approximate and may vary slightly from the listed dimensions. Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists. (We do not provide this service). Automatic movement winds with the movement of your arm. It is recommended that you wind the watch every two weeks. A screw-down crown (knob) creates a water-resistant seal. To unscrew the crown, turn counter-clockwise and pull/push into position to set time, date, and other functions. To close the crown, press it against the case and turn clockwise.