Omega Pre-owned Speedmaster 3510.50 Wristwatch. Condition: Used (very good) — Rank A Used: a few traces of usage; glass, case, bezel and case back show insignificant scratches; dial and hands show no deterioration; crown shows no scratches; band shows slight stains/dirt and is aftermarket (pin buckle aftermarket); accessories: None; maintenance: polished; serial number: 56**0170; total weight 60 g; wrist size 14 cm - 18 cm (5.51'' - 7.08''). Key attributes: Black | Stainless steel | Self-winding (automatic) movement | Lightweight (60 g) | Chronograph | Aftermarket leather strap | Aftermarket pin buckle | Black dial | 39 mm stainless steel case | Sport style | Polished case | Dimensions & fit: Fits wrist circumference: 14 cm - 18 cm (5.51'' - 7.08'') | Regular fit on the wrist | Composition & care: Stainless steel (case) | Leather (band) | Wipe case and glass with a soft, dry cloth. Avoid prolonged exposure to water. Have movement serviced by a professional watchmaker. Clean leather strap with a damp cloth and allow to air dry.