The OMEGA Speedmaster is one of OMEGA’s most iconic timepieces. Having been a part of all six lunar missions, the legendary Speedmaster is an impressive representation of the brand’s adventurous pioneering spirit. This OMEGA Speedmaster Professional “Moonwatch” features a black dial covered by a scratch-resistant sapphire crystal and graced by a small seconds sub-dial, 30-minute recorder and 12-hour recorder along with a central chronograph hand. The black bezel, with its tachymetric scale, is mounted on a 42 mm stainless steel case and presented on a black leather strap. At the heart of this chronograph is OMEGA’s mechanical calibre 1863, a descendent of the legendary manual-winding movement worn on the Moon, visible through the transparent caseback. This timepiece is offered with a special Moonwatch presentation box which contains a \"NATO\" strap, a strap for astronauts, a tool to change the bracelet and a book highlighting Speedmaster\'s adventures. FEATURESChronograph: 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. 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. Transparent Case Back: A transparent case back - frequently made of sapphire - makes it possible to see the movement inside the watch. MOVEMENTCaliber Omega 1863: Famous manual-winding chronograph movement. A descendent of the calibre that was worn on the Moon. Rhodium-plated finish. TECHNICAL DATABetween Lugs: 20mm Bracelet: Steel Case: Steel Case Diameter: 42mm Dial Colour: Black Crystal: Domed, scratch-resistant sapphire crystal with anti-reflective treatment inside Water Resistance: 50 Metres