SJ Product .New Omega Speedmaster Moonwatch Series 310.63.42.50.02.001 OB2 .The core story of the professional Moonwatch is that the watch worn by Armstrong was left in the lunar module. The case is made of imported 316 stainless steel, featuring delicate angles and a prominent 3D design complemented by the bezel. The luminous dial uses Swiss imported luminescent materials, crafted through multiple printing processes. Paired with a domed sapphire crystal, the case measures 42mm and can be matched with either a stainless steel bracelet or a NATO military strap. The movement is powered by the classic 3861 Master Chronometer manual-winding chronograph movement. Experiencing a manual chronograph is essential to understanding its completeness! You won't know until you try! S1 exquisitely recommends this multifunctional mechanical watch for men.