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 model features a black dial 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 stainless steel bracelet. At the heart of this timepiece is OMEGA's mechanical calibre 1861, a manual-winding movement. Reference 311.30.42.30.01.004 Between lugs Open Case Measurement Modal 18 mm Lug‑to‑lug Open Case Measurement Modal 48.20 mm Thickness Open Case Measurement Modal 13.80 mm Case diameter Open Case Measurement Modal 42 mm Case Steel Dial colournBlack Crystal Hesalite crystal with OMEGA logo in the centre Water resistance 5 bar (50 metres / 165 feet) Watch size Gents Total product weight (approx.) 156 g Calibre Omega 1861 Movement Type Manual‑winding Power reserve 48 hours