Omega Pre-owned Speedmaster Professional 'Moonwatch' Chronograph — Good, but used condition. Stainless steel case with a black tachymeter scale and a hand-wound Cal. 1861 movement (measured accuracy +4 s/d, 305° amplitude). Matte black dial with Luminova baton hour markers, three sub-dials and white Luminova hands. Case shows visible signs of wear with a small nick at 9 o’clock; bracelet shows noticeable signs of wear. Diameter approx. 42 mm, measured without crown; fits wrists up to approx. 19 cm. Key attributes: Black | Stainless steel | Hand-wound Cal. 1861 movement | Measured accuracy: +4 s/d, 305° amplitude | Tachymeter scale | Chronograph function | Hand-wound movement | Luminescent hands and hour markers | Stainless steel bracelet (Ref. 1998, end links no. 849) | Matte black dial | Three sub-dials | Baton hour markers | White hands | Black tachymeter bezel | Dimensions & fit: Fits wrists up to approx. 19 cm | Composition & care: Stainless steel | Clean with a soft, lint-free cloth. Service periodically by a qualified watchmaker. Avoid strong magnets and prolonged moisture.