OMEGA Speedmaster First OMEGA in Space

The Omega Speedmaster First OMEGA in Space, reference 310.30.40.50.06.001, is a chronograph with a 39.7 mm steel case. The case is 13.38 mm thick and measures 48 mm lug to lug. Omega rates the case to 50 metres. Calibre 3861 is a manual-winding movement with a Co-Axial escapement and a 50 hour power reserve. The calibre is certified as a Master Chronometer. The blue dial sits under a sapphire crystal with a hesalite-like form and an anti-reflective treatment on the inside, and the watch has a tachymeter and small seconds. A steel bracelet with a foldover butterfly clasp and comfort setting is fitted to the watch.