Omega Speedmaster Moonwatch Moonphase 3870.50.31

Omega Speedmaster Professional Moonwatch 42 mm Ref. 3870.50.31 Stainless steel case, polished and satin-finished, case diameter 42 mm, case height 14 mm, steel bezel with black insert and tachymeter scale, black leather strap with folding clasp, black dial with luminous hour markers, luminous hands, hand-wound movement, chronograph, Omega caliber 1861, 21,600 vph, approximately 48-hour power reserve, central hours and minutes display, small seconds at 9 o'clock, Hesalite crystal, screw-down and engraved stainless steel case back, water-resistant to 5 bar. Pre-owned watch, very good condition, without box or papers, originally delivered in Germany in 2009.