The Speedmaster 38 mm collection has been crafted with simplicity, size and colour in mind, yet still retains the look and heritage of OMEGA’s most famous chronograph. This model features a stainless steel case and bezel which includes a tachymeter scale on a black aluminium ring. The black dial includes rhodium-plated indexes and hands, three subdials and a date window at 6 o\'clock. The watch has a stainless steel bracelet, a Seahorse medallion on the caseback, and is driven by the OMEGA Co-Axial Calibre 3330. Calibre Omega 3300: Self-winding chronograph with column-wheel mechanism and Co-Axial escapement. Free sprung-balance equipped with Si14 silicon balance spring. Officially certified chronometer. FEATURESAutomatic Watch: A self-winding watch or automatic watch uses a mechanical movement whose main spring is wound automatically by the natural motion of the wearer\'s arm. Chronograph: The chronograph function is a mechanism for measuring time intervals. A chronograph watch can therefore be used to time events while displaying the time like any traditional watch. Chronometer: Label given to a watch which has undergone precision tests and received a certificate from an official body (COSC).Date: The day of the month, displayed in a window on a watch dial at the 3 or 6 o’clock position, or within a subdial at 9 o\'clock. Small Seconds: A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute. Tachymeter: A tachymeter watch has a function for measuring speed. It is a chronograph with a graduated dial on which speed can be read in kilometres per hour based on a 1000 metre distance. Between lugs18mm Bracelet Steel Case Steel Case diameter38mm Dial colour Black Crystal Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides Water resistance100 Metres