Omega Speedmaster movement pre-owned with CHRONEXT certification. Features automatic mechanical chronograph movement, screw-down crown, tachymeter scale, date indication function, round case measuring 41mm in diameter crafted from black stainless steel, geometric dial face design, baton hour and minute hands set against a black or geometric background, two chronograph pushers located at the four o'clock and seven-and-three-quarter o'clock positions, adjustable link bracelet with folding clasp closure mechanism including safety clasp. Authenticity guaranteed by CHRONEXT certified watchmakers; includes CHRONEXT two-year warranty for movement repairs.